Land Rover Rover 214 Repair 1689 09 Rover Manual
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1689 Rover 214 & 414 Updated Version 09/97 9 Chapter 9 Braking system Anti-lock Braking System (ABS) - component removal and refitting . . 26 Brake pedal - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Front brake caliper - removal, overhaul and refitting . . . . . . . . . . . . 12 Front brake disc - inspection, removal and refitting . . . . . . . . . . . . . 13 Front brake pads - inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Front brake pads - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 General information and precautions . . . . . . . . . . . . . . . . . . . . . . . . 1 Handbrake cables - removal and refitting . . . . . . . . . . . . . . . . . . . . . 24 Handbrake lever - removal and refitting . . . . . . . . . . . . . . . . . . . . . . 23 Hydraulic fluid - level check and renewal . . . . . . . . . . . . . . . . . . . . . 5 Hydraulic pipes and hoses - inspection . . . . . . . . . . . . . . . . . . . . . . 7 Hydraulic pipes and hoses - renewal . . . . . . . . . . . . . . . . . . . . . . . . 8 Hydraulic system - bleeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Master cylinder - removal, overhaul and refitting . . . . . . . . . . . . . . . 9 Pressure regulating valve - testing, removal and refitting . . . . . . . . . 14 Rear brake caliper - removal, overhaul and refitting . . . . . . . . . . . . . 21 Rear brake disc - inspection, removal and refitting . . . . . . . . . . . . . 22 Rear brake drum - removal, inspection and refitting . . . . . . . . . . . . . 17 Rear brake pads - inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Rear brake pads - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Rear brake shoes - inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Rear brake shoes - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Rear wheel cylinder - removal, overhaul and refitting . . . . . . . . . . . . 18 Stop lamp switch - removal, refitting and adjustment . . . . . . . . . . . 25 Vacuum servo unit - testing, removal and refitting . . . . . . . . . . . . . . 3 Vacuum servo unit check valve - removal, testing and refitting . . . . 4 9•1 Contents Specifications Brake system Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dual hydraulic circuit, split diagonally on models without ABS and front to rear on models with ABS. Disc front brakes. Drum rear brakes except on models with ABS which have rear disc brakes. Vacuum servo-assistance on all models. Cable-operated handbrake on rear brakes Front brakes Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disc, with single piston sliding caliper Disc diameter: Non-ABS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238 mm ABS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262 mm Disc thickness: New: Non-ABS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.80 mm ABS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.60 mm Minimum thickness after machining: Non-ABS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.70 mm ABS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.00 mm Maximum disc run-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.02 mm Brake pad friction material minimum thickness . . . . . . . . . . . . . . . . . . . 3.0 mm Easy,suitable for novice with little experienceFairly easy,suitable for beginner with some experienceFairly difficult, suitable for competent DIY mechanic Difficult,suitable for experienced DIY mechanicVery difficult, suitable for expert DIY or professional Degrees of difficulty 54321
Rear brakes Non-ABS Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single leading shoe drum Drum diameter: New . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mm Maximum diameter after machining . . . . . . . . . . . . . . . . . . . . . . . . . . 204 mm Maximum drum ovality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.012 mm Brake shoe friction material minimum thickness . . . . . . . . . . . . . . . . . . 2.0 mm ABS Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disc, with single piston sliding caliper Disc diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239 mm Disc thickness: New . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mm Minimum thickness after machining . . . . . . . . . . . . . . . . . . . . . . . . . . 8 mm Maximum disc run-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.06 mm Brake pad friction material minimum thickness . . . . . . . . . . . . . . . . . . . 3.0 mm Torque wrench settingsNm lbf ft Servo vacuum hose-to-inlet manifold union bolt . . . . . . . . . . . . . . . . . . 50 37 Brake hose union bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 28 Master cylinder-to-servo unit nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 13 Master cylinder brake pipe union nuts . . . . . . . . . . . . . . . . . . . . . . . . . . 24 18 Brake caliper guide pin bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 24 Brake disc retaining screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9 Front brake caliper bracket-to-hub bolts . . . . . . . . . . . . . . . . . . . . . . . . 81 60 Pressure regulating valve union nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 10 Rear brake drum retaining screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 Rear wheel cylinder-to-backplate bolts . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 Rear brake caliper bracket-to-trailing arm bolts . . . . . . . . . . . . . . . . . . . 40 30 Handbrake cable-to-underbody retaining bolts . . . . . . . . . . . . . . . . . . . 22 16 ABS modulator mounting nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 ABS modulator brake pipe union nuts: Upper union nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 11 Lower union nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 18 ABS front wheel sensor retaining bolts . . . . . . . . . . . . . . . . . . . . . . . . . 25 18 ABS rear wheel sensor retaining bolts . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 ABS wheel sensor wiring bracket bolts . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 ABS rear wheel sensor cover and cover strap bolts . . . . . . . . . . . . . . . 10 7 Roadwheel nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 74 9•2 Braking system 1689 Rover 214 & 414 Updated Version 09/97 1.0a Non-ABS braking system component layout 1 Primary hydraulic circuit 2 Secondary hydraulic circuit 3 Brake pipe - pressure regulating valve to right-hand front hose 4 Brake pipe - pressure regulating valve to left-hand front hose 5 Brake pipe - pressure regulating valve to right-hand rear hose 6 Brake pipe - pressure regulating valve to left-hand rear hose 7 Brake pipe - hose to rear wheel cylinder 8 Brake flexible hose - brake pipe to front brake caliper 9 Brake flexible hose - rear wheel 10 Handbrake cable 11 Pressure regulating valve
1 General information and precautions General information The braking system is of the servo- assisted, dual circuit hydraulic type. The arrangement of the hydraulic system is such that each circuit operates one front and one rear brake from a tandem master cylinder. Under normal circumstances both circuits operate in unison. However, in the event of hydraulic failure in one circuit, full braking force will still be available at two wheels (see illustrations). On models not equipped with an Anti-lock Braking System (ABS), a pressure regulating valve is also incorporated in the hydraulic circuit to regulate the pressure applied to the rear brakes and reduce the possibility of the rear wheels locking under heavy braking. On models equipped with ABS, the pressure regulating valve is fitted is but it is non- operational. All models are fitted with front disc brakes. Models equipped with ABS are fitted with ventilated discs, whereas non-ABS models are fitted with solid discs. The disc brakes are actuated by single piston sliding type calipers which ensure that equal pressure is applied to each disc pad. Non-ABS models are fitted with rear drum brakes, incorporating leading and trailing shoes which are actuated by twin piston wheel cylinders. A self-adjust mechanism is incorporated to automatically compensate for brake shoe wear. As the brake shoe liningswear, the footbrake operation automatically operates the adjuster mechanism quadrant which effectively lengthens the shoe strut and repositions the brake shoes to remove the lining-to-drum clearance. ABS models are equipped with rear disc brakes. The disc brakes are actuated by a single piston sliding caliper which incorporates a mechanical handbrake mechanism. On all models, the handbrake provides an independent mechanical means of rear brake application. Full details of ABS system operation are as follows. Anti-lock Braking System (ABS) - operation ABS is available as an option on all models covered in this Manual. The system comprises a modulator block which contains an ABS Electronic Control Unit (ECU), hydraulic solenoid valves and accumulators, and an electrically-driven return pump. One sensor is fitted to each roadwheel. The purpose of this system is to prevent wheel locking during heavy braking. This is achieved by automatic release of the brake on the relevant wheel, followed by reapplication of the brake. The solenoids are controlled by the ECU which receives signals from the four roadwheel sensors, which in turn monitor the speed of rotation of each wheel. By comparing these speed signals from the four wheels, the ECU can determine the speed at which the vehicle is travelling. It can then use this speed to determine when a wheel is decelerating at an abnormal rate compared to the speed of the vehicle and therefore predict when a wheel is about to lock. During normaloperation, the system functions in the same way as a non-ABS braking system. If the ECU senses that a wheel is about to lock, the ABS system enters the ‘pressure maintain’ phase. The ECU operates the relevant solenoid valve in the modulator block which then isolates the brake caliper on the wheel which is about to lock from the master cylinder, effectively sealing in the hydraulic pressure. If the speed of rotation of the wheel continues to decrease at an abnormal rate, the ABS system then enters the ‘pressure decrease’ phase, where the electrically-driven return pump operates and pumps the hydraulic fluid back into the master cylinder, releasing pressure on the brake caliper so that the brake is released. Once the speed of rotation of the wheel returns to an acceptable rate, the pump stops and the solenoid valve opens thereby allowing the hydraulic master cylinder pressure to return to the caliper which then reapplies the brake. This cycle can be carried out at up to 10 times a second. The action of the solenoid valves and return pump creates pulses in the hydraulic circuit. When the ABS system is functioning, these pulses can be felt through the brake pedal. The solenoid valves connected to the front calipers operate independently, but the valve connected to the rear calipers, together with the pressure regulating valve, operates both calipers simultaneously. Operation of the ABS system is entirely dependent on electrical signals. To prevent the system responding to any inaccurate signals, a built-in safety circuit monitors all signals received by the ECU. If an inaccurate signal or low battery voltage is detected, the ABS system is automatically Braking system 9•3 1.0b ABS braking system component layout 9 1689 Rover 214 & 414 Updated Version 09/971 Primary hydraulic circuit 2 Secondary hydraulic circuit 3 Brake pipe - modulator to pressure regulating valve 4 Brake pipe - modulator to pressure regulating valve 5 Brake pipe - modulator to right-hand front hose 6 Brake pipe - modulator to left-hand front hose 7 Brake pipe - modulator to right-hand rear hose 8 Brake pipe - modulator to left-hand rear hose 9 Pressure regulating valve 10 Handbrake cable 11 Brake flexible hose - brake pipe to front brake caliper 12 Brake flexible hose - brake pipe to rear brake caliper
shut down and the warning lamp on the instrument panel is illuminated to inform the driver that the ABS system is not operational. If a fault does develop in the ABS system the vehicle must be taken to a Rover dealer for fault diagnosis and repair. Precautions Hydraulic fluid is poisonous. Wash off immediately and thoroughly in the case of skin contact and seek immediate medical advice if any fluid is swallowed or gets into the eyes. Certain types of hydraulic fluid are inflammable and may ignite when allowed into contact with hot components. When servicing any hydraulic system, it is safest to assume that the fluid is inflammable and to take precautions against the risk of fire as though it is petrol that is being handled. Hydraulic fluid is also an effective paint stripper and will attack plastics. If any is spilt, it should be washed off immediately using copious quantities of fresh water. Hydraulic fluid is hygroscopic, that is, it absorbs moisture from the air, so old fluid may be contaminated and unfit for further use. When topping-up or renewing fluid, always use the recommended type and ensure that it comes from a freshly-opened sealed container. When working on brake components, take care not to disperse brake dust into the air, or to inhale it, since it may contain asbestos which is injurious to health. When servicing any part of the system, work carefully and methodically. Also observe scrupulous cleanliness when overhauling any part of the hydraulic system. Always renew components (in axle sets, where applicable) if in doubt about their condition and use only genuine Rover replacement parts, or at least those of known good quality. 2 Brake pedal- removal and refitting 2 Removal 1Working inside the vehicle, undo the five screws and remove the right-hand lower facia panel. 2Extract the R-clip and clevis pin securing the servo unit pushrod to the brake pedal. 3Using pliers, carefully unhook the brake pedal return spring from the pedal to release all the spring tension. 4Slacken and remove the nut and washers (as applicable) from the brake pedal pivot bolt then withdraw the pivot bolt and remove the brake pedal and return spring. 5Examine all brake pedal components for signs of wear, paying particular attention to the pedal bushes, pivot bolt and return spring, renewing as necessary. Refitting 6Refitting is a reverse of the removal procedure. Lubricate the bushes, pivot bolt and clevis pin with multi-purpose grease. 7On completion, check the operation of the pedal and ensure that it returns smoothly to its at rest position under the pressure of the return spring. 3 Vacuum servo unit- testing, removal and refitting 3 Testing 1To test operation of the servo unit, depress the footbrake several times to exhaust the vacuum, then start the engine whilst keeping the pedal firmly depressed. As the engine starts, there should be a noticeable ‘give’ in the brake pedal as the vacuum builds up. Allow the engine to run for at least two minutes then switch it off. If the brake pedal is now depressed it should feel normal, but further applications should result in the pedal felling firmer, with the pedal stroke decreasing with each application. 2If the servo does not operate as described, inspect the servo unit check valve, see Section 4. 3If the servo unit still fails to operate satisfactorily, the fault lies within the unit itself. Repairs to the unit are possible but special tools are required and the work should be entrusted to a suitably equipped Rover dealer. Removal 4Remove the air cleaner assembly. 5Remove the master cylinder. 6Disconnect the vacuum hose connection from the grommet on the servo unit, taking great care not to damage or displace the sealing grommet (see illustration). 7Working inside the vehicle, undo the five retaining screws and remove the right-hand lower facia panel. 8Extract the R-clip and clevis pin securing the servo unit pushrod to the brake pedal (see illustration).9Slacken and remove the four nuts securing the servo unit to the engine compartment bulkhead then remove the unit, noting the gasket which is fitted to the rear of the unit. Refitting 10Prior to refitting, check the servo unit to vacuum hose sealing grommet for signs of damage or deterioration and renew if necessary. 11Fit a new gasket to the rear of the servo unit and reposition the unit in the engine compartment. 12From inside the vehicle, ensure the servo unit pushrod is correctly engaged with the brake pedal then refit the servo unit mounting nuts and tighten them securely. 13Refit the servo unit pushrod to brake pedal clevis pin and secure it in position with the R-clip. 14Refit the right-hand lower facia panel, tightening its retaining screws securely. 15From inside the engine compartment, carefully ease the vacuum hose connection back into position in the servo unit, taking care not to displace the sealing grommet. 16Refit the air cleaner assembly and master cylinder. 17On completion, start the engine and check for air leaks at the vacuum hose to servo unit connection and the operation of the braking system. 4 Vacuum servo unit check valve- removal, testing and refitting 2 Note:The vacuum servo unit check valve is only available as part of the vacuum hose assembly. Do not try to remove the valve, the servo unit connection, or the inlet manifold union from the hose or air leaks may ensue, necessitating renewal of the hose assembly. 9•4 Braking system 3.8 Vacuum servo unit and pushrod attachments 1 Servo unit mounting nuts 2 Pushrod clevis pin 3 R-clip 3.6 Master cylinder mounting nuts (A) and servo vacuum hose connection (B) 1689 Rover 214 & 414 Updated Version 09/97
Removal 1Carefully unplug the hose connection from the vacuum servo unit taking care not to damage the sealing grommet. 2Unscrew the union bolt securing the vacuum hose assembly to the inlet manifold and withdraw the hose assembly from the engine compartment. Remove the union bolt from the hose end and discard the sealing washers. Testing 3Examine the hose for damage, splits, cracks or general deterioration. Make sure that the check valve inside the hose is working correctly by blowing through the hose from the servo unit connection end. Air should flow in this direction but not when blown through from the inlet manifold union. Renew the hose and check valve assembly if at all suspect. 4Examine the servo unit sealing grommet for signs of damage or deterioration and renew if necessary. Refitting 5Position a new sealing washer on each side of the hose union and refit the hose-to-inlet manifold union bolt. Ensure that the hose union locating pin is correctly situated between the lugs on the manifold then tighten the union bolt to the specified torque setting (see illustration). 6Carefully ease the hose connection into the servo unit sealing grommet, taking care not to displace or damage the grommet. 7On completion, start the engine and check the vacuum hose-to-servo unit connection for signs of air leaks. 5 Hydraulic fluid- level check and renewal Refer to “Weekly Checks”and Chapter 1. 6 Hydraulic system- bleeding 3 General 1The correct operation of any hydraulic system is only possible after removal of all air from the components and circuit. This is achieved by bleeding the system. 2During the bleeding procedure, add only clean, unused hydraulic fluid of therecommended type. Never re-use fluid that has already been bled from the system. Ensure that sufficient fluid is available before starting work. 3If there is any possibility of incorrect fluid being already in the system, the brake components and circuit must be flushed completely with uncontaminated, correct fluid and new seals should be fitted to the various components. 4If hydraulic fluid has been lost from the system, or air has entered because of a leak, then ensure that the fault is cured before proceeding further. 5Park the vehicle on level ground, switch off the engine and select first or reverse gear, then chock the wheels and release the handbrake. 6Check that all pipes and hoses are secure, unions tight and bleed screws closed. Clean any dirt from around the bleed screws. 7Unscrew the master cylinder reservoir cap and top the master cylinder reservoir up to the MAX level line. Refit the cap loosely and remember to maintain the fluid level at least above the MIN level line throughout the procedure or there is a risk of further air entering the system. 8There are a number of one-man, do-it- yourself brake bleeding kits currently available from motor accessory shops. It is recommended that one of these kits is used whenever possible as they greatly simplify the bleeding operation and also reduce the risk of expelled air and fluid being drawn back into the system. If such a kit is not available, then the basic (two-man) method must be used which is described in detail below. 9If a kit is to be used, prepare the vehicle as described previously and follow the kit manufacturer’s instructions as the procedure may vary slightly according to the type being used. Generally, they are as outlined below in the relevant sub-section. 10Whichever method is used, the same sequence must be followed (paragraphs 11 and 12) to ensure the removal of all air from the system. Bleeding sequence 11If the system has been only partially disconnected and suitable precautions weretaken to minimise fluid loss, it should be necessary only to bleed that part of the system (ie: the primary or secondary circuit). 12If the complete system is to be bled, then it should be done working in the following sequence: Non-ABS models Left-hand front brake. Right-hand rear brake. Right-hand front brake. Left-hand rear brake. ABS models Left-hand front brake. Right-hand front brake. Left-hand rear brake. Right-hand rear brake. Bleeding - basic (two-man) method 13Collect a clean glass jar, a suitable length of plastic or rubber tubing which is a tight fit over the bleed screw and a ring spanner to fit the screw. The help of an assistant will also be required. 14Remove the dust cap from the first screw in the sequence. Fit the spanner and tube to the screw, place the other end of the tube in the jar and pour in sufficient fluid to cover the end of the tube. 15Ensure that the master cylinder reservoir fluid level is maintained at least above the MIN level line throughout the procedure. 16Have the assistant fully depress the brake pedal several times to build up pressure, then maintain it on the final stroke. 17While pedal pressure is maintained, unscrew the bleed screw (approximately one turn) and allow the fluid and air to flow into the jar. The assistant should maintain pedal pressure, following it down to the floor if necessary and should not release it until instructed to do so. When the flow stops, tighten the bleed screw again, release the pedal slowly and recheck the reservoir fluid level. 18Repeat the steps given in paragraphs 16 and 17 until the fluid emerging from the bleed screw is free from air bubbles. If the master cylinder has been drained and refilled and air is being bled from the first screw in the sequence, allow approximately five seconds between cycles for the master cylinder passages to refill. 19When no more air bubbles appear, tighten the bleed screw securely, remove the tube and spanner and refit the dust cap. Do not overtighten the bleed screw. 20Repeat the procedure on the remaining screws in the sequence until all air is removed from the system and the brake pedal feels firm again. Bleeding - using a one-way valve kit 21As their name implies, these kits consist of a length of tubing with a one-way valve Braking system 9•5 4.5 Ensure hose union locating pin is correctly located between lugs on inlet manifold 9 1689 Rover 214 & 414 Updated Version 09/97 Hydraulic fluid is an effective paint stripper and will attack plastics. If any is spilt, it should be washed off immediately using copious quantities of fresh water.
fitted to prevent expelled air and fluid being drawn back into the system. Some kits include a translucent container which can be positioned so that the air bubbles can be more easily seen flowing from the end of the tube (see illustration). 22The kit is connected to the bleed screw, which is then opened. The user returns to the driver’s seat and depresses the brake pedal with a smooth, steady stroke and slowly releases it. This sequence is repeated until the expelled fluid is clear of air bubbles. 23Note that these kits simplify work so much that it is easy to forget the master cylinder reservoir fluid level. Ensure that this is maintained at least above the MIN level line at all times. Bleeding - using a pressure bleeding kit 24These kits are usually operated by the reservoir of pressurised air contained in the spare tyre, although note that it will probably be necessary to reduce the pressure to a lower limit than normal. Refer to the instructions supplied with the kit. 25By connecting a pressurised, fluid-filled container to the master cylinder reservoir, bleeding can be carried out simply by opening each screw in turn (in the specified sequence) and allowing the fluid to flow out until no more air bubbles can be seen in the expelled fluid. 26This method has the advantage that the large reservoir of fluid provides an additional safeguard against air being drawn into the system during bleeding. 27Pressure bleeding is particularly effective when bleeding ‘difficult’ systems or when bleeding the complete system at the time of routine fluid renewal. All methods 28When bleeding is complete and firm pedal feel is restored, wash off any spilt fluid, tighten the bleed screws securely and refit their dust caps. 29Check the hydraulic fluid level and top up if necessary. 30Discard any hydraulic fluid that has been bled from the system as it will not be fit for re- use. 31Check the feel of the brake pedal. If itfeels at all spongy, air must still be present in the system and further bleeding is required. Failure to bleed satisfactorily after a reasonable repetition of the bleeding procedure may be due to worn master cylinder seals. 7 Hydraulic pipes and hoses- inspection Refer to Chapter 1, Section 6. 8 Hydraulic pipes and hoses- renewal 3 1If any pipe or hose is to be renewed, minimise fluid loss by removing the master cylinder reservoir cap and then tightening it down onto a piece of polythene (taking care not to damage the sender unit) to obtain an airtight seal. Alternatively, flexible hoses can be sealed by using a proprietary brake hose clamp, while metal brake pipe unions can be plugged (if care is taken not to allow dirt into the system) or capped immediately they are disconnected (see illustration). Place a wad of rag under any union that is to be disconnected to catch any spilt fluid. 2If a flexible hose is to be disconnected, unscrew the brake pipe union nut before removing the spring clip which secures the hose to its mounting bracket. 3To unscrew the union nuts it is preferable to obtain a brake pipe spanner of the correct size. These spanners are available from most large motor accessory shops (see illustration). Failing this, a close-fitting open- ended spanner will be required, though if the nuts are tight or corroded, their flats may be rounded-off if the spanner slips. In such a case, a self-locking wrench is often the only way to unscrew a stubborn union but it follows that the pipe and the damaged nuts must be renewed on reassembly. Always clean a union and surrounding area before disconnecting it. If disconnecting a component with more than one union, make a careful note of the connections before disturbing any of them.4If a brake pipe is to be renewed, then it can be obtained from Rover dealers, cut to length and with the union nuts and end flares in place. All that is then necessary is to bend it to shape, following the line of the original, before fitting it to the vehicle. Alternatively, most motor accessory shops can make up brake pipes from kits but this requires very careful measurement of the original to ensure that the replacement is of the correct length. The safest answer is usually to take the original to the shop as a pattern. 5On refitting, do not overtighten the union nuts. The specified torque wrench settings, where given, are not high and it is not necessary to exercise brute force to obtain a sound joint. When refitting flexible hoses, always renew any sealing washers used. 6Ensure that the pipes and hoses are correctly routed with no kinks and that they are secured in the clips or brackets provided. After fitting, remove the polythene from the reservoir and bleed the hydraulic system. Wash off any spilt fluid and check carefully for fluid leaks. 9 Master cylinder- removal, overhaul and refitting 4 Warning: Do not syphon brake fluid by mouth as it is poisonous. Note:Before attempting to overhaul the master cylinder, check the price and availability of individual components and compare this with the price of a new or reconditioned unit, as overhaul may not be viable on economic grounds alone. Removal 1Remove the master cylinder reservoir cap, having disconnected the sender unit wiring connector, and syphon all hydraulic fluid from the reservoir. Do not syphon the fluid by mouth as it is poisonous but use a syringe or an old poultry baster. Alternatively, open any convenient bleed screw in the system and gently pump the brake pedal to expel the fluid through a plastic tube connected to the screw. 9•6 Braking system 8.1 Using a brake hose clamp to minimise fluid loss 6.21 Using a one-way valve kit to bleed braking system 1689 Rover 214 & 414 Updated Version 09/97 8.3 Using a brake pipe spanner to unscrew a union nut
2Wipe clean the area around the brake pipe unions on the side of the master cylinder and place absorbent rags beneath the pipe unions to catch any surplus fluid. Unscrew the two union nuts and carefully withdraw the pipes. Plug or tape over the pipe ends and master cylinder orifices to minimise loss of brake fluid and to prevent the entry of dirt into the system. Wash off any spilt fluid immediately with cold water. 3Slacken and remove the two nuts and washers securing the master cylinder to the vacuum servo unit then withdraw the unit from the engine compartment. Remove the O-ring from the rear of the master cylinder and discard it. Overhaul 4Remove the master cylinder from the vehicle as described above and clean it thoroughly. 5Carefully prise the reservoir from the master cylinder body and remove the two mounting seals (see illustrations). 6Prepare a clean working surface and proceed as follows. Non-ABS system 7Using a wooden dowel, press the primary piston in as far as possible and extract thesecondary piston stop pin from the reservoir inlet port, then remove the retaining circlip. 8Noting the order of removal and the direction of fitting of each component, withdraw the piston assemblies with their springs and seals, tapping the body on to a clean wooden surface to dislodge them. If necessary, clamp the master cylinder body in a vice (fitted with soft jaw covers) and use compressed air of low pressure (applied through the secondary circuit fluid port) to assist the removal of the secondary piston assembly. 9Thoroughly clean all components using only methylated spirit, isopropyl alcohol or clean hydraulic fluid as a cleaning medium. Never use mineral-based solvents such as petrol or paraffin which will attack the hydraulic system’s rubber components. Dry the components immediately using compressed air or a clean, lint-free cloth. 10Check all components and renew any that are worn or damaged. Check particularly the cylinder bores and pistons. The complete assembly should be renewed if these are scratched, worn or corroded. If there is any doubt about the condition of the assembly or of any of its components, renew it. Check that the body’s inlet and bypass ports are clear.11If the assembly is fit for further use, obtain a repair kit. Renew all seals and O-rings disturbed on dismantling, never re-use them. Renew also any other items included in the repair kit. 12On reassembly, soak the pistons and new seals in clean hydraulic fluid. Smear clean fluid into the cylinder bore. 13Fit the new seals to their pistons, using only the fingers to manipulate them into the grooves. 14Insert the pistons into the bore by using a twisting motion to avoid trapping the seal lips. Ensure that all components are refitted in the correct order and the right way round. 15Press the secondary piston assembly fully up into the bore using a clean wooden dowel, then refit the stop pin. 16Refit the primary piston assembly, then secure it in position with a new circlip. 17Press the new mounting seals into the master cylinder body and carefully refit the reservoir ensuring that it is pressed fully into position. ABS system 18Carefully prise out the dust cap from the rear of the master cylinder body and remove the flat washer. 19Using a wooden dowel, press the primary Braking system 9•7 9.5a Non-ABS master cylinder components 1 Master cylinder reservoir 2 Mounting seals 3 Secondary piston stop pin 4 Master cylinder body5 Spring 6 Circlip 7 Primary piston 8 Secondary piston9.5b ABS master cylinder components 1 Master cylinder reservoir 2 Mounting seals 3 Master cylinder body4 Spring 5 Secondary piston 6 Retaining pin 7 Grub screw 8 Spring9 Primary piston 10 Washer 11 Circlip 12 Flat washer 13 Dust cap 9 1689 Rover 214 & 414 Updated Version 09/97
piston in as far as possible and extract the circlip and washer. Withdraw the primary piston assembly and spring. 20Undo the grub screw from the underside of the master cylinder body then use the wooden dowel to press the secondary piston into the body and withdraw the secondary piston retaining pin. Extract the secondary piston assembly and spring. If necessary, the piston can be dislodged by tapping the master cylinder body on a wooden block. 21Examine and overhaul the master cylinder components as described above in paragraphs 9 to 14. 22Fit the spring to the secondary piston assembly and use a clean wooden dowel to press the assembly fully into the master cylinder bore. Align the slot in the piston with the retaining pin hole then insert the secondary piston retaining pin. Refit the grub screw and tighten it securely. 23Fit the spring to the primary piston assembly and press the assembly into position using the wooden dowel. Refit the washer and secure the piston assembly in position with the circlip, ensuring that it is correctly located in its groove in the master cylinder bore. 24Fit the flat washer and refit the dust cap to the rear of the master cylinder body. 25Align the lugs on the new mounting seals with the slots in the master cylinder body and press them into position. Carefully refit the reservoir, ensuring that it is pressed fully into the master cylinder body.Refitting 26Remove all traces of dirt from the master cylinder and servo unit mating surfaces, then fit a new O-ring to the groove on the master cylinder body. 27Fit the master cylinder to the servo unit, ensuring that the servo unit pushrod enters the master cylinder bore centrally. Refit the master cylinder washers and mounting nuts and tighten them to the specified torque. 28Wipe clean the brake pipe unions then refit them to the master cylinder ports and tighten them to the specified torque setting. 29Refill the master cylinder reservoir with new fluid and bleed the hydraulic system. 10 Front brake pads- inspection Refer to Chapter 1. 11 Front brake pads- renewal 2 Warning: Renew both sets of front brake pads at the same time. Never renew the pads on only one wheel as uneven braking may result. The dust created by pad wear may contain asbestos, which is a health hazard.Never blow it with compressed air or inhale it. An approved filtering mask should be worn when working on the brakes. DO NOT use petroleum-based solvents to clean brake parts. Use brake cleaner or methylated spirit only. Removal 1Chock the rear wheels, firmly apply the handbrake then jack up the front of the vehicle and support it on axle stands. Remove both front roadwheels. 2Remove the lower caliper guide pin bolt whilst, if necessary, using a slim open-ended spanner to prevent the guide pin itself from rotating. Pivot the caliper away from the disc to gain access to the brake pads and tie it to the suspension strut using a piece of wire (see illustrations). 3Remove the circular shim which is fitted to the caliper piston (see illustration). 4Remove the brake pads from the caliper mounting bracket whilst noting the correct position of the pad retainer springs and pad shims (see illustration). 5Measure the thickness of friction material remaining on each brake pad (see illustration). If either pad is worn at any point to the specified minimum thickness or less, all four pads must be renewed. Also, the pads should be renewed if any are fouled with oil or grease as there is no satisfactory way of degreasing friction material once contaminated. If any of the brake pads are worn unevenly or fouled with oil or grease, trace and rectify the cause before reassembly. New brake pad kits are available from Rover dealers and include new shims and pad retainer springs. 6If the brake pads are still serviceable, carefully clean them using a clean, fine wire brush or similar, paying particular attention to the sides and back of the metal backing. Clean out the grooves in the friction material (where applicable) and pick out any large embedded particles of dirt or debris. Carefully clean the pad retainer springs and the pad locations in the caliper body and mounting bracket. Fitting 7Prior to fitting the pads, check that the guide pins are free to slide easily in the caliper 9•8 Braking system 11.5 Measuring thickness of brake pad friction material11.4 Removing pads with springs and shims11.3 Removing circular shim from caliper piston 11.2b . . . and pivot caliper away from disc11.2a Remove lower caliper guide pin bolt . . . 1689 Rover 214 & 414 Updated Version 09/97
bracket and check that the rubber guide pin gaiters are undamaged (see illustration). Brush the dust and dirt from the caliper and piston but do notinhale it as it is injurious to health. Inspect the dust seal around the piston for damage and the piston for evidence of fluid leaks, corrosion or damage. Renew as necessary. 8On refitting, first fit the pad retainer springs to the caliper mounting bracket (see illustration). 9Apply a thin smear of high-temperature brake grease (silicone- or PBC/Poly Butyl Cuprysil-based) or anti-seize compound (eg Holts Copaslip) to the sides and back of each pad’s metal backing and to those surfaces of the caliper body and mounting bracket which bear on the pads. Fit the shims to the back of both pads and apply a thin smear of lubricant to the back of each shim. Do not allow the lubricant to foul the friction material (see illustration). 10Install the brake pads in the caliper mounting bracket, ensuring that the friction material is against the disc. 11If new brake pads have been fitted, the caliper piston must be pushed back into the cylinder to make room for them. Either use a G-clamp or similar tool, or use suitable pieces of wood as levers. Provided that the master cylinder reservoir has not been overfilled with hydraulic fluid there should be no spillage but keep a careful watch on the fluid level while retracting the piston. If the fluid level rises above the MAX level line at any time, the surplus should be syphoned off or ejected via a plastic tube connected to the bleed screw. 12Apply a thin smear of the recommended lubricant (see above) to the circular shim and fit the shim to the caliper piston. Pivot the caliper body down over the brake pads then refit the bottom guide pin bolt and tighten it to the specified torque wrench setting. 13Check that the caliper body slides smoothly in the mounting bracket, then depress the brake pedal repeatedly until the pads are pressed into firm contact with the brake disc and normal (non-assisted) pedal pressure is restored. 14Repeat the above procedure on the remaining front brake caliper.15Refit the roadwheels, then lower the vehicle to the ground and tighten the roadwheel nuts to the specified torque setting. 16On completion, check the hydraulic fluid level. 12 Front brake caliper- removal, overhaul and refitting 4 Warning: Brake hydraulic fluid may be under considerable pressure in a pipeline, take care not to allow hydraulic fluid to spray into the face or eyes when loosening a connection. Removal 1Chock the rear wheels, firmly apply the handbrake, jack up the front of the vehicleand support on axle stands. Remove the appropriate front roadwheel. 2Minimise fluid loss either by removing the master cylinder reservoir cap and then tightening it down onto a piece of polythene to obtain an airtight seal (taking care not to damage the sender unit), or by using a brake hose clamp, a G-clamp or a similar tool to clamp the flexible hose. 3Clean the area around the union, then undo the brake hose union bolt and disconnect the hose from the caliper. Plug the end of the hose and the caliper orifice to prevent dirt entering the hydraulic system. Discard the sealing washers as they must be renewed whenever disturbed. 4Unscrew the two caliper guide pin bolts whilst, if necessary, using a slim open-ended spanner to prevent the guide pins themselves from rotating (see illustration). 5Carefully lift the caliper assembly off the brake pads and remove the circular shim from Braking system 9•9 11.9 . . . and fit shims on pads11.8 Fit pad retainer springs to caliper bracket . . .11.7 Check condition of guide pins and gaiters before refitting pads 12.4 Front brake caliper components 9 1689 Rover 214 & 414 Updated Version 09/971 Bleed screw 2 Caliper body 3 Guide pin bolt 4 Guide pin 5 Gaiter 6 Pad retainer spring 7 Caliper mounting bracket 8 Inner pad shim 9 Brake pads 10 Outer pad shim 11 Piston seal 12 Piston 13 Dust seal 14 Circular shim
the caliper piston. Note that the brake pads need not be disturbed and can be left in position in the caliper mounting bracket. Overhaul 6With the caliper on the bench, wipe away all traces of dust and dirt. Avoid inhaling the dust as it is injurious to health. 7Withdraw the piston from the caliper body and remove the dust seal. The piston can be withdrawn by hand or if necessary, pushed out by applying compressed air to the union bolt hole. Only low pressure should be required such as is generated by a foot pump. 8Using a small screwdriver, extract the piston hydraulic seal whilst taking great care not to damage the caliper bore. 9Withdraw the guide pins from the caliper mounting bracket and remove the guide pin gaiters. 10Thoroughly clean all components using only methylated spirit, isopropyl alcohol or clean hydraulic fluid as a cleaning medium. Never use mineral-based solvents such as petrol or paraffin which will attack the hydraulic system’s rubber components. Dry the components immediately using compressed air or a clean, lint-free cloth. Use compressed air to blow clear the fluid passages. 11Check all components and renew any that are worn or damaged. Check particularly the cylinder bore and piston. These should be renewed (note that this means the renewal of the complete body assembly) if they are scratched, worn or corroded in any way. Similarly, check the condition of the guide pins and their bores in the mounting bracket. Both guide pins should be undamaged and (when cleaned) a reasonably tight sliding fit in the mounting bracket bores. If there is any doubt about the condition of any component, renew it. 12If the assembly is fit for further use, obtain the appropriate repair kit. Components are available from Rover dealers in various combinations. 13Renew all rubber seals, dust covers and caps. Also the sealing washers disturbed on dismantling. 14On reassembly, ensure that all components are absolutely clean and dry.15Soak the piston and the new piston (fluid) seal in clean hydraulic fluid. Smear clean fluid on the cylinder bore surface. 16Fit the new piston (fluid) seal using only the fingers to manipulate it into the cylinder bore groove. Fit the new dust seal to the piston and refit it to the cylinder bore using a twisting motion, ensuring that the piston enters squarely into the bore. Press the piston fully into the bore, then secure the dust seal to the caliper body. 17Apply the grease supplied in the repair kit, or a good quality high-temperature brake grease (silicone- or PBC/Poly Butyl Cuprysil- based) or anti-seize compound (eg Holts Copaslip), to the guide pins and fit the new gaiters. Fit the guide pins to the caliper mounting bracket, ensuring that the gaiters are correctly located in the grooves on both the guide pin and mounting bracket. Refitting 18Refit the circular shim to the piston and carefully slide the caliper into position over the brake pads. Refit the caliper guide pin bolts and tighten them to the specified torque setting. 19Position a new sealing washer on each side of the hose union and refit the brake hose union bolt. Ensure that the brake hose union is correctly positioned between the lugs on the caliper then tighten the union bolt to the specified torque setting. 20Remove the brake hose clamp, where fitted, and bleed the hydraulic system. Providing the precautions described were taken to minimise brake fluid loss, it should only be necessary to bleed the relevant front brake. 21Refit the roadwheel then lower the vehicle to the ground and tighten the roadwheel nuts to the specified torque. 13 Front brake disc- inspection, removal and refitting 3 Note:If either brake disc requires renewal, both should be renewed at the same time to ensure even and consistent braking. Inspection 1Chock the rear wheels, firmly apply the handbrake, jack up the front of the vehicle and support on axle stands. Remove the appropriate front roadwheel. 2Slowly rotate the brake disc so that the full area of both sides can be checked. Remove the brake pads if better access is required to the inboard surface. Light scoring is normal in the area swept by the brake pads but if heavy scoring is found, then the disc must be renewed. The only alternative to this is to have the disc surface-ground until it is flat again, but this must not reduce the disc to less than the minimum thickness specified. 3It is normal to find a lip of rust and brake dust around the disc’s perimeter. This can be scraped off if required. If, however, a lip has formed due to excessive wear of the brake pad swept area, then the disc’s thickness must be measured by using a micrometer (see illustration). Take measurements at four places around the disc at the inside and outside of the pad swept area. If the disc has worn at any point to the specified minimum thickness or less, then it must be renewed. 4If the disc is thought to be warped, it can be checked for run-out (at a point 6.0 mm in from the disc’s outer edge) by either using a dial gauge mounted on any convenient fixed point, while the disc is slowly rotated, or by using feeler gauges to measure (at several points all around the disc) the clearance between the disc and a fixed point, such as the caliper mounting bracket (see illustration). If the measurements obtained are at the specified maximum or beyond, the disc is excessively warped and must be renewed. However, it is worth checking first that the hub bearing is in good condition. Also, try the effect of removing the disc and turning it through 180º to reposition it on the hub. If run-out is still excessive the disc must be renewed. 5Check the disc for cracks, especially around the stud holes, and any other wear or damage. Renew it if any of these are found. Removal 6Unscrew the two bolts securing the caliper mounting bracket to the swivel hub and slide the caliper assembly off the disc (see illustration). 9•10 Braking system 13.6 Removing caliper assembly13.4 Using a dial gauge to check brake disc run-out13.3 Using a micrometer to measure brake disc thickness 1689 Rover 214 & 414 Updated Version 09/97