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Land Rover Defender 90 110 Workshop Book 4 Rover

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    							SUSPENSION 
    S. I ... 
    .I 11. Remove the inner seal and bearing  cone. 
    12.  If new  bearings  are to be  fitted  drift or press  out the 
    old  cups. 
    13.  Degrease  and examine  the hub  for  cracks  and 
    damage  and  renew 
    if necessary.  Renew  hub if 
    wheel studs are faulty. 
    Assemble 
    14. If removed,  fit the  stub  axle to the  axle  casing  with 
    a new joint washer  and secure  with the six nuts  and 
    bolts  and tighten  to the  correct torque. 
    15. Fit  new  inner  and outer  bearing  cups to the hub, 
    ensuring  that they  are drifted 
    or pressed  squarely 
    into  position. 
    16. Fit the  inner  bearing  cone and pack with  one of the 
    recommended  hub greases. 
    - Fitting  inner oil seal 
    17. Clean the  hub oil  seal  housing and  ensure that  the 
    seal locating  surface is smooth  and the chamfer  on 
    the  leading  edge is also  smooth  and  free from 
    burrs. 
    18. Examine  the  new  seal and ensure  that it is  clean, 
    undamaged  and that  the garter  spring  is properly 
    located. Even  a  small scratch  on  the seal  lip could 
    impair  its efficiency. 
    19.  Although  the new  seal is already  pre
    -greased  by 
    the  manufacturer,  apply one 
    of the recommended 
    hub  bearing  greases  to the  outside  diameter 
    of the 
    seal, before fitting, taking care  not to damage  the 
    lip. 
    20. Place  the seal,  lip side leading,  squarely on the hub 
    and  using  the 
    76 mm end of seal replacer  tool 
    LST 550-5 and drift 550 or 18 G 134 drive  the seal 
    into  position  to the depth  determined  by the  tool. 
    Fitting  outer oil seal 
    21.  Fit the  new  outer  bearing cone  and pack  with one 
    of  the  recommended  hub greases. 
    22.  Carry  out instructions 
    17 to 19 but  insert  the seal 
    with  the lip side  trailing. 
    23.  Place  the seal, lip side leading,  squarely on the hub 
    and  using  the 
    72 mm end of seal replacer tool 
    LST 550-5 and drift 550 or 18 G 134,  drive  the seal 
    into  position 
    to the depth  determined  by the  tool. 
    Fitting  hub to stub  axle 
    24. Smear  the  lips of both seals with one of the 
    recommended  greases. 
    This is important since a 
    dry seal  can  be destroyed  during the first  few 
    revolutions 
    of the hub. 
    25. Select  a  new seal  track  spacer  and  check that the 
    outer  diameter  is smooth and  free  from blemishes 
    26. Taking care not  to damage  the seal  lips fit the hub 
    assembly  to the stub  axle. 
    Do not allow  the weight 
    of  the  hub 
    to rest,  even  temporarily, on the  outer 
    seal otherwise  damage  and distortion could  occur. 
    Therefore  hold the hut  clear 
    of the stub axle until 
    the  seal  track spacer 
    is fitted. 
    27. Carefully fit the seal  track spacer,  seal lip leading. 
    28. Fit  the  hub  inner  nut  and  using spanner  606435 
    tighten  the adjusting  nut whilst slowly  revolving 
    the 
    hub until all  end-float is removed  then back-off the 
    nut approximately half-a-turn. 
    29.  Mount  a dial test indicator and bracket 
    on the hub 
    so that  the stylus  rests in a loaded  condition on the 
    nut.  Check  the end
    -float  which  must be 0,013 to 
    0,010 mm (0.0005 to 0.0004 in). Adjust  the  nut as 
    necessary to achieve this. 
    30,  Fit the  locker  and  locknut  and  tighten against  the 
    adjusting  nut. 
    31. Rotate the hub  several times  to settle the bearings 
    then  re
    -check  the end-float. 
    32.  Bend  one segment 
    of the  locker over  the adjusting nut 
    and  another,  diametrically opposite,  over the locknut. 
    V/ , 
    32, 
    32’ 
    ST1800M Y// 
    33. Using  a  new joint  washer,  fit the  hub  driving 
    member  and secure  with the five  bolts  and tighten 
    evenly  to the  correct  torque. 
    34. Fit the  circlip  to the  axle  shaft  ensuring  that it is 
    properly  seated in the groove. 
    35. Fit  the hub cap. 
    36. Fit the  road  wheels  and secure  with the nuts. 
    Jack
    -up  the  vehicle,  remove axle stands and lower 
    vehicle to ground.  Finally  tighten  the road  wheel 
    nuts  to the  correct  torque. 
    and  that  there  are no burrs 
    on the  chamfered 
    leading  edge. 
    11  
    						
    							I64 1 SUSPENSION 
    ST 
    KEY TO HUB COMPONENTS 
    1. Hub cap. 
    2.  Circlip. 
    3.  Spring washer
    - hub  driving  member bolt. 
    4. Hub driving  member. 
    5. Hub driving  member  bolts. 
    6. Brake drum retaining  screws. 
    8. Outer bearing  cup. 
    9. Inner bearing  cup. 
    10. Inner bearing  cone. 
    11. End-float adjustingnut. 
    12. Inner  oil seal. 
    13.  Joint  washer. 
    7. Otter bearing cone. 
    stub axle to axle  casing 14. Locknut. 
    15. Bolt. 
    16. Axle  shaft 
    17. Locknut. 
    18. Lock washer. 
    19. Joint  washer. 
    21.  Hub  casting. 
    22.  Brake  drum. 
    23.  Outer  oil seal. 
    24.  Road  wheel 
    stud. 
    25. Stub  axle. 
    20. %a! !El& SFX€!r. 
    12  
    						
    							SUSPENSION 164 I 
    . 
    OVERHAUL REAR SUSPENSION 
    Remove  the lower  links . .. .A c. -. . 
    1. Jack up the rear of the vehicle  and lower on to axle 
    stands. 
    2.  Remove 
    the nut  and  bolt  retaining  the lower link to 
    the  axle  bracket. 
    3. Remove  the three  nuts and  bolts  retaining  the 
    foward  end of the  link  to the  chassis  bracket. 
    4.  Withdraw  the lower  link from  the vehicle. 
    5.  Remove  the  locknut and washer  and  remove  the 
    flexible  mounting from  the link. 
    Renew the bushes 
    6. Press  out the bush  from  the rear end of the  lower 
    link. 
    7.  Press  in a new  bush  squarely  into the link. 
    Fit the lower  link 
    8. Assemble  the flexible  mounting  to the  link  and 
    secure  with the  locknut  but  do not  tighten  at this 
    stage. 
    9. Fit  the  link  to the vehicle,  securing  the front  end of 
    the 
    link to the  chassis  bracket  with the three  nuts 
    and  bolts. 
    10.  Assemble  the  rear end 
    of the link to the axle 
    bracket  and retain  with the nut and  bolt, but do not 
    tighten  at this  stage. 
    11. Lower  the  vehicle to the  ground  and  allow the 
    suspension  to settle. 
    12.  Tighten  the nut and bolt at  the rear  end of the  link. 
    13.  Tighten  the  forward  locknut to 176 
    Nm 
    (130  lbf ft). 
    Remove upper links 
    22.  Using  ball joint extractor tool R01006 or a suitable 
    proprietry  tool  remove  the ball joint  from the axle 
    bracket. 
    23.  Remove the  pivot bracket  complete  with the ball 
    joint  and 
    if fitted,  the  lower ball joint of the 
    levelling  unit. 
    24.  Remove  the two  bolts  securing  the ball  joint  to the 
    pivot  bracket  and press  the  ball joint  from  the 
    bracket. 
    NOTE: Replacement  ball  joints  are supplied as 
    complete assemblies packed  with grease. 
    25. Using  two  bolts  as a guide  to ensure  correct 
    alignment press  the knurled  ball joint into  the 
    pivot 
    bracket and secure  with the two nuts and bolts. 
    Assemble upper links  and ball joints 
    26.  Fit  the pivot  bracket  ball joint  and bracket  to the 
    axle and  secure with the plain washer 
    castle nut and 
    split  pin. Tighten  the nut  to 176 
    Nm (130 Ibf  ft). 
    27. 
    Fit the  levelling  unit, if used. 
    28.  Assemble  the upper links to the  chassis  attachment 
    brackets  but do not  at this  stage  fully tighten  the 
    pivot nut  and bolt. 
    29.  Fit the upper  link 
    assemblics to the chassis with the 
    six  nuts  and bolts,  (three  each side).  Note the 
    positions of the bolt  heads.  Tighten  the  nuts to 
    47 Nm (35 lbf ft). 
    30.  Secure the  rear ends of the  upper  links 
    to the pivot 
    bracket  and tighten  the two  nuts  and  bolts and 
    tighten  to 115 
    Nm (85  Ibf ft). 
    31. Remove  the jack  from  the chassis,  allow thc 
    suspension  to settle  and tighten  upper link  pivot 
    bolts. 
    14. 
    15. 
    16. 
    17. 
    18. 
    19. 
    Jack  up the  vehicle  under the chassis so that  the 
    rear  axle 
    is freely  suspended. 
    Remove nuts and bolts retaining the upper link 
    bracket to the chassis  frame. 
    Remove the  two nuts and  bolts securing  the upper 
    links  to the  pivot  bracket. 
    Withdraw  the upper links complete  with the chassis 
    attachment  brackets from vehicle. 
    Remove  the 
    nut and bolt  retaining  forward  end of 
    the  link  to the  chassis  bracket  and  separate the  two 
    parts. 
    Press out  the bush  from  the forward  end of the 
    Renew anti-roll bar bushes  and ball joints 
    32.  Remove  the two nuts  and bolts  securing  the anti- 
    roll bar to the axle  link. 
    33. Remove  the eight  nuts  and  bolts (four  each side) 
    retaining  the anti
    -roll  bar to  the chassis  and remove 
    the bar  from the vehicle. 
    34.  Remove the  split pin and  castle  nut and  remove 
    the 
    ball joint  and link  from  the axle  location. 
    If the ball  joint requires replacement  the complete 
    link must  be renewed. 
    35.  Renew  the  rubbers  and fit the  anti
    -roll  bar  to  the 
    chassis  and  secure  with the eight  bolts and nuts 
    tightening  to 24 
    Nm (18 lbf ft). 
    36.  Fit the  ball  joint  and link  to the  axle  location and links 2.d squ.re!y press in new bushes. 
    Renew pivot bracket  ball joint tighten the castle nut  to  176 Nm (130 lbf ft) and fit 
    a new  split  pin. --  - 20. Remove  the levelling unit -if fitted. 
    21.  Remove  the split  pin, castle  nut  and plain  washer  37. 
    Fit the  anti-roll  bar  to the  ball  joint  link and fit new 
    bushes  in the  sequence  illustrated  and tighten  the 
    nuts and bolts, 
    to the  correct  torque. 
    13 
    securing  the ball  joint to the pivot  bracket.  
    						
    							-- I 12 3 
    1. Salisbury axle casing 
    2. Anti-roll bar 
    3. Boge  self levelling unit 
    4. Levelling  unit upper  ball joint  assembly 
    5. Levelling unit  lower ball joint  assembly 
    6. Fulcrum bracket 
    7. Fulcrum  bracket ball joint  assembly 
    8.  Suspension  top links 
    9. Top link mounting brackets 
    10. 
    Top link  bushes 
    11. Lower links 
    f*) ti 
    REAR  SUSPENSION 
    A1 
    12.  Lower link flexible  bush assembly 
    13. Lower link bush and  bolt  assembly 
    14. Coil spring assembly 
    15. 
    Bumpstop 
    16. Shock  absorber 
    17.  Shock  absorber  top bush assembly 
    18.  Shock  absorber lower bush assembly 
    19. Anti-roll bar bush  and strap  assembly 
    20.  Anti
    -roll  bar  ball joint and  link assembly 
    21. Heavy duty  Rover axle casing 
    18  
    						
    							SUSPENSION 
    A Boge Hydromat levelling  unit is located  in the  centre 
    of  the rear  axle. 
    When  the vehicle  is unladen  the  levelling unit  has little 
    effect.  The 
    unit is self-energising  and hence  the vehicle 
    has  to be  driven  before  the unit  becomes  effective, the 
    time  taken  for this to  happen  being dependant  upon the 
    vehicle  load,  the  speed at which  it is  driven  and  the 
    roughness  of the  terrain  being crossed. 
    If the  vehicle is overloaded  the  unit will fail to level 
    fully  and  more  frequent  bump  stop contact will be 
    noticed. 
    Should  the vehicle  be left  for a lengthy  period e.g. 
    overnight,  in a  laden  condition, 
    it may settle. This is 
    due to  normal  internal 
    fluid movement  in the  unit  and 
    is not detrimental to  the unit performance. 
    Before  carrying  out  the checks  below,  verify that  the 
    vehicle  is being  operated  within the specified  maximum 
    loading capabilities. 
    If the  levelling unit  is then  believed 
    to  be  at fault,  the procedure  below should  be followed. 
    Whilst  slight 
    oil seepage IS permissible,  the unit  should 
    be  renewed 
    if there  is an  excessive  oil leak. 
    1.  Remove  excessive  mud  deposits from underneath 
    the  vehicle  and  any  heavy  items  from inside  the 
    vehicle  that are not  part 
    of the original  equipment. 
    2.  Measure  the clearance between  the  rear axle bump 
    pad  and the  bump  stop rubber  at the  front  outer 
    corner  on both  sides 
    of the  vehicle,  dimension A. 
    The average  clearance  should be in excess of 
    67 mm (2.8  in). 
    3. If thc bump stop  clearance is less  than  the above 
    figure  remove  the  rear springs and  check the free 
    length against  the following  data in the  chart. 
    4. Renew  any spnng  where  the free length  is more 
    than  20 
    mm (0.787  in) shorter  than the figures  in 
    the  chart. 
    5. Having refitted or renewed  any springs  repeat the 
    clearance  check as described  above.  If the  average 
    bump  clearance 
    is still  less  than 67 mm (2.8 in) 
    renew 
    the levelling  unit. 
    . ., ,. 
    . 
    L 
    64 
    r-- Steering 
    Side 
    1 R.H. 
    Part Rate Number  Free length  Colour 
    Number 
    Nm (Ibhn) ofcoils (mm) Code 
    t--- PASSENGER 1 R.H. 
    One Green 
    and 
    onc 
    White stripe ._ .- NRC  7000  31.5 (180)  6 400 
    6. Load  weights  to the  value of 650 kg (1143  Ibs) 
    evenly  over the rear  load  area of the  vehicle  and 
    leave  it to  settle undisturbed  for minimum  period 
    of  thirty  minutes. 
    7.  With  the driving  seat occupied 
    or with  an 
    approximate  equivalent weight of 75 
    kg (165 Ibs) 
    check  the bump  stop clearance  and  note the 
    measurPment. 
    8. Drive  the vehicle  on a test  route  approximately 
    5 km (3 miles)  in length  over undulating  roads  or 
    graded tracks.  At the  completion  of the  drive  bring 
    the  vehicle  to  rest  by light  brake  application 
    so as 
    not  to disturb  the vehicle loading. 
    9. Without  disturbing  the vehicle  load  and  with thc 
    driving seat occupied,  check the  bump  stop 
    clearance  and  note the reading,  which must be 
    in 
    excess  of 45 mm (average). 
    10.  Subtract the  reading obtained  under  Instruction 
    7 
    from that  obtained  under Instruction  9. If the 
    change 
    in clearance  is in  excess  of 10 mm (0.394 in) 
    the  levelling  unit is functioning correctly. 
    11. If the figures  obtained  in instructions 9  and 10 do 
    not  exceed 
    45 mm and 10 mm (1.77 and  0.39  in) 
    respectively  unload the vehicle  and renew  the 
    levelling  unit. 
    PASSENGER 
    One Green 
    White stripe 
    NRC 
    7000  31.5  (180)  6 
    400 and onc 
    Two Blue 
    stripes 
    DRIVER I NRC 
    6388  31.5 (180) I 6 I 412 1 
    Two Blue 
    stripes 
    DRIVER I NRC6388 131.5 
    (180) 1 6 1 412 1 
    15  
    						
    							1641 SUSPENSION 
    REMOVE LEVELLING  UNIT - where fitted 
    WARNING:  The levelling  unit contains  pressurised  gas 
    and  must  not be dismantled  nor the casing  screws 
    removed.  Repair 
    is by replacement of complete  unit 
    only. 
    1. Raise and  support the vehicle  under the chassis and 
    use  a jack 
    to support  the weight of the axle. 
    2. Disconnect the upper  links at the pivot  bracket. 
    3.  Ease  up the 
    levclling unit  lower  gaiter and  unscrew 
    the  lower  ball joint  at the  push  rod using  thin jawed 
    spanners. 
    4. Release the  webbing strap from the chassis. 
    5. Remove  the four  nuts  securing the  top bracket  to 
    the  chassis  and withdraw  the  levelling  unit 
    complete  with bracket. 
    Renew  levelling  unit ball joints 
    The-ball joints for the levelling unit  may be dismantled 
    for 
    clcaning and cxamination. 
    6.  Unscrew  the  lower ball joint  from thc pivot 
    7.  Unscrew 
    thc ball  joint  from the top bracket. 
    8. Reassemble  the  ball joints,  packing  with 
    Dextagrease 
    G.P. or  equivalent  or if necessary 
    renew the joints 
    if worn. 
    9. Check  the  condition  of the gaitcrs and  renew if 
    necessary. 
    1 
    bracket. 
    Fit levelling  unit 
    10. Ensure  the ball  pin  threads are clean  and  smear 
    Loctite  grade CVX  on the  ball pin  threads. 
    11. Fit the upper  ball joint  to  the  levelling unit and 
    secure the gaiter. 
    12. Fit  the  top  bracket  complete with  levelling  unit to 
    the chassis and sccure with the four  nuts  and 
    tighten  to  47 
    Nm (35 Ibf ft). 
    13.  Fit  the levelling  unit 
    to the lower  ball joint and 
    secure the gaiter. 
    14.  Attach  the webbing  strap to the  chassis  cross 
    member. 
    15. Fit  the  upper  links to the  pivot  bracket  and retain 
    with  the  two  bolts and nuts  but do 
    not tighten  at 
    this  stage. 
    16.  Remove  the jack  in support 
    of the axle  and the 
    support  from under  the chassis. 
    17.  Allow  the suspension 
    to settle  and then  tighten  the 
    two  bolts  and nuts  retaining the upper  links 
    to the 
    pivot  bracket  to 
    thc correct torque. 
    SPRINGS AND SHOCK ABSORBERS 
    Remove  rear springs 
    1. Slacken the rLAr road  wheel  nuts and  raise the rear 
    of  the 
    vehick and  lower  the  chassis on the  axle 
    stands 
    or similar  supports  and  remove  the road 
    wheels. 
    16 
    2. Support the  weight of the axle  with  a jack. 
    3. Disconnect  the shock  absorbers  at the  lower  end. 
    4. Remove the spring  retainer plate. 
    5. Lower the axle sufficiently  to withdraw the spring, 
    but  take  care  not to stretch  the flexible  brake hose 
    by  lowering  the axle  too far. 
    6. Remove the  spring pan. 
    Renew rear springs 
    7. Fit the spring  pan and retainer  plate. 
    8. Fit the spring  into the chassis  top location  and using 
    9. Secure  the  shock  absorbers with the  rubbers 
    10. Remove  the axle  support,  fit the  road  wheels and 
    11. Finally tighten the road  wheel nuts. 
    a 
    turning  motion 
    fit the spring  to the  axle  pan. 
    correctly  located. 
    lower  the vehicle  to ground. 
    - Remove  shock absorbers ,p- ..h 
    12. Slacken  the  road  wheel nuts, raise  the  rear of the 
    vehicle  and support  it under  the axle  and remove 
    the  road wheels. 
    13. Remove  the shock  absorber  upper  and lower 
    retaining  nuts and rubbers. 
    14.  Remove the  shock absorber  from the top  locating 
    shaft and withdraw 
    it from  the vehicle. 
    --. h 
    Test  shock  absorbers 
    15. Hold the shock  absorber  vertically  in a vice,  being 
    careful 
    not to damage the  threads. 
    16. The shock  absorber  employs  differential  damping 
    having  greater  resistance  on the  extension  stroke. 
    Check  operation  by extending  and compressing the 
    shock  absorber. 
    Resistance  should be uniform  throughout  the 
    length  of each  stroke.  If resistance  is erratic 
    or 
    weak,  renew  the shock  absorber.  When checking 
    resistance  a new  shock  absorber  may be used  for 
    comparison. 
    To ensure  that the new  shock 
    absorber  is primed,  fully extend  and compress  the 
    unit several  times before  testing begins. 
    Fit shock  absorbers 
    17. Fit the shock  absorbers  using new rubbers  and  fit 
    18. Fit the  road  wheels,  lower the vehicle  and finally 
    the 
    lower  rubbers  and caps  in the order  illustrated. 
    tighten 
    the road  wheel  nuts.  
    						
    							.. . . ,..: ~. .,”, :;.c ..., :.... .* .*-‘ ,.. , 
    . .. .. 
    , ,. ,. 
    in 
    17  
    						
    							BRAKING SYSTEM 
    . . ... ,....... ... .. . ... ..>:. \., .. ., ._ : ?Y!:. .:. 
    BRAKES 
    DESCRIPTION 
    The mechanical  components  of the  Land  Rover  90 and 
    110  braking  system  consist 
    of single cylinder  Girling 
    drum  brakes  at 
    the rear and Lockheed,  four  piston 
    caliper  disc brakes  at  the  front.  The 
    cable controlled 
    handbrake  is a  mechanically  operated single drum 
    mounted 
    on the  output  shaft of the transfer  box and is 
    completely  independent 
    of the main  braking  system. 
    Adjustment  of  all drum brakes 
    is by a snail  cam turned 
    by  a square  peg 
    on the back-plates. 
    The  basic  hydraulic  system involves  two separate  and 
    independent  primary  and  secondary circuits which 
    permit  a degree  of braking  should  a  fault occur in one 
    of the  circuits.  The primary  circuit operates  the rear 
    brakes  and the secondary  circuit controls  the front 
    brake  calipers.  The tandem  master  cylinder, which is 
    assisted  by a  type 
    50 direct  acting  servo, is fed by a 
    divided  fluid reservoir.  The rear  section  contains  fluid 
    for  the  primary  cicuit and the front  portion  supplies 
    fluid  for the  secondary  circuit. 
    Land Rover 90 models have a brake  fluid loss switch 
    fitted  to 
    the master  cylinder  filler cap. The switch  is 
    wired  to a  warning  lamp  bulb 
    on the drivers  control 
    panel  and the bulb  will illuminated  momentarily  when 
    the  starter  motor is actuated,  indicating  that the brake 
    warning  circuit 
    is functioning  correctly.  A hydraulic 
    failure  in 
    the primary  or secondary  circuits will result  in 
    fluid  loss  and cause  the warning  bulb to illuminate,  in 
    such  an  event,  the driver  must stop  the  vehicle 
    immediately  and investigate  the cause. 
    In some 
    territories,  alternative  and additional  switches  and 
    controls  may be fitted (as described  in the  following for 
    110  models)  to meet  legal legislation. 
    Land  Rover 110 models have a Pressure  Differential 
    Warning  Actuator  Valve (P.D.W.A.  Valve) or in 
    some 
    cases  a  combined  P.D.W.A.  Valve and a Pressure 
    Conscious  Reducing  Valve  (P.C.R. Valve) situated 
    between  the  master  cylinder  and the front  and  rear 
    brakes. 
    The  valves  are bolted  to the  bulkhead  within the engine 
    compartment.  The type  of  valve  fitted is dependent 
    upon  the  nature 
    of the vehicle  and the braking 
    classification  regulations  prevailing  in the  territory 
    where  the ehicle  is 
    to operate.  Both types of valve 
    incorporate  an electrical switch wired  to a 
    warning bulb 
    on  the  vehicle  control  panel.  The bulb  will illuminate 
    momentarily  when the starter  motor is actuated 
    indicating  that the brake  warning  circuit is functioning 
    correctly.  A  fault 
    in either  the  primary or secondary 
    circuits  is evident 
    if the  warning bulb  illuminates  upon 
    application 
    of the  foot  brake while the engine is 
    running.  Should  a pressure  failure  occur in the front 
    brake  circuit  (secondary)  the piston  in the  P.D.W.A. 
    valve  will 
    move in the  diretion of the failed  circuit 
    causing  the switch  to operate  and 
    the warning  bulb to 
    illuminate.  At the  same  time full  fluid prcssure in the 
    - . 
    primary  circuit to  the  rear  brakes  will continue.  The 
    P.D.W.A.  will function  in a  similar  manner should  a 
    failure  occur in the  primary,  rear  brake  circuit.  A 
    Girling  type 
    80 vacuum  servo  is fitted  when  a 
    combination  valve is used. 
    The P.C.R.  valve allows fluid  to the  rear brakes  until a 
    predetermined  pressure 
    is reached  when the valve 
    closes.  the valve,  from this point  on, will  only permit  a 
    proportion 
    of any  increase in  fluid pressure to  reach the 
    rear brakes  to prevent  premature  locking of the  rear 
    wheels.  Should a failure  occur in the  front  brake 
    secondary  circuit the design 
    of the valve  will ensure  that 
    the  fluid  to 
    the rear  brakes  will by-pass  the valve  and 
    allow  full circuit  pressure  to the rear wheel  cylinder. 
    To satisfy  the demand of other  regulations  certain 
    vehicles  are  equipped  with  a deceleration 
    actuated 
    anti
    -lock  valve  fitted  in the  rear  brake  (primary) line 
    instead 
    of a  P.C.R.  valve. Then this valve is used  a 
    Girling  type 
    80 vacuum  servo is fitted.  The valve  is 
    situated  on the inner face of the  chassis  right
    -hand side 
    member at 
    an angle of 20 to  the  horizontal so that the 
    angle of inclination  is towards the front  of the  vehicle. 
    Under  normal  braking  conditions  the valve  remains 
    passive.  When fierce 
    or emergency braking  is necessary 
    the  valve  operates  at a pre
    -determined  deceleration 
    figure and  reduces  the rate 
    of increase in the hydraulic 
    pressure to the  wheel cylinders. 
    A. Primary circuit. 
    B. Secondary  circuit. 
    C. P.D.W.A. or combination  valve. 
    1  
    						
    							170 I BRAKING SYSTEM 
    3. Removing friction pads - early type 
    Remove  the retaining  pins  and  anti
    -rattle springs 
    and  withdraw  the pads. 
    If the same pads  are to be 
    refitted,  identify them  for assembly  to their  original 
    iocations. 1 2 
    A B Removing  friction pads - latest type 
    Remove  the four  spring  clips and remove  the 
    retaining  pins and anti
    -rattle  springs  and withdraw 
    the  pads.  If the  same  pads  are to be  refitted, 
    identify  them for assembly  to  their original 
    locations. 
    4, Remove  the two  bolts  and withdraw  the caliper 
    from  the vehicle. 
    3 4 
    6 
    ,- 
    continued ST532M 
    A. Combination  valve. 
    B. P.D.W.A. valve. 
    C. G. valve. 
    1. Inlet from  master cylinder  to secondary circuit. 
    2. Inlet  from  master cylinder  to primary circuit. 
    3. Outlet  to front calipers  via T junction. 
    4. Outlet to rcar brakes  via T junction. 
    5. Inlet port. 
    6. Outlet port. 
    7. Angle of inclination (20°C). 
    REMOVE  AND OVERHAUL  FRONT BRAKE 
    CALIPERS 
    Special  tool: 
    186672 -Piston clamp 
    NOTE:  The following  procedure 
    is applicable  to Land 
    Rover 
    90 and 110 models. A 110 caliper  is illustrated 
    and  varies  mainly  in size  and  external  pipe connections 
    from  the 
    90 version. 
    REMOVE  CALIPER 
    1. Slacken the front  wheel retaining nuts, jack-up the 
    vehicle  and lower  onto axle stands  and remove  the 
    wheels. 
    2. Expose  the brake  flexible  hose  by moving  the nn;I~rl m,ntn,-t;.ra ,-nsraAnn qnA rlomn thn hnco LULb y1UkbbLnb bUbLII~ Ull -.unnmy %L.b .IUI. 
    Disconnect  the hose  from  the caliper. 
    NOTE:  The first  illustration  shows the early  type 
    of 
    friction  pad retaining  pins and anti-rattle  springs. 
    The  second  illustration  shows the latest  anti
    -rattle 
    springs  and method 
    of retaining  the pads,  using 
    parallel  pins and retaining  clips, or split  pins. 
    2 
    /. -% E- L  
    						
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