brake LAND ROVER DEFENDER 1996 Repair Manual

STEERING
7
FAULT DIAGNOSIS 2. STEERING VEER
From 1. GENERAL STEERING:
1.Vehicle veers, not under braking, swap front
tyres side to side.
2.Is problem resolved?
YES - end
NO - continue.
3.Does vehicle now veer in other direction?
YES - fit new tyres
NO - continue.
4.Recentralise steering box
See Adjustment,
Centralise Steering Box.
5.Is problem resolved?
YES - end
NO - contact local technical office.3. VEER UNDER BRAKING
From 1. GENERAL STEERING:
1.Vehicle veers under braking, bleed brake
system.
2.Is problem resolved?
YES - end
NO - continue.
3.Check brake pads for glazing, and discs, axles
etc for contamination.
4.Is problem resolved?
YES - end
NO - continue.
5.Check brake lines and hoses for deterioration.
Replace as necessary.
6.Is problem resolved?
YES - end
NO - continue.
7.Contact local technical office.

57STEERING
10
FAULT DIAGNOSISREV: 05/99 VISUAL AND SAFETY CHECKS
WARNING: Before taking vehicle out on
the public highway for road test, it is
important that the following basic visual
checks are carried out to ensure that the vehicle
complies with legal requirements.
Tyres and wheel rims
1.Check and adjust tyre pressures
See
GENERAL SPECIFICATION DATA,
Information, Tyre Pressures
.
Note that this information refers to standard tyres
fitted as original equipment.
2.Check condition of tyres. Inspect for signs of
uneven wear, damage and feathering. Check
tread depth.
3.Ensure that the tyre make, type and general
condition are common across each axle.
4.Check wheel rims for signs of damage and
excessive run out.
5.Carry out road test
See Road Test Procedure
.
ROAD TEST PROCEDURE
General steering/handling problems can usually be
classified into one of the categories listed and ARE
GENERALLY RELATED TO THE AGE, CONDITION
AND USE OF THE VEHICLE.
WARNING: Ensure that all road tests are
conducted by suitably qualified drivers in
a safe and legal manner, and where local
traffic conditions allow.
1.Carry out visual and safety checks
See Visual
and Safety Checks
.
Confirm general nature of complaint with customer,
simulating where possible the conditions under which
the problem occurs. Carry out following road test
procedure to establish the problem.2.Steering load assessment - drive at 16 km/h (10
mph). Put 90°turn input into steering wheel,
check self centering. The self centering should
be equal on each lock but not necessarily return
to exactly straight ahead without assistance from
the driver.
3.Steering assessment - drive at 64 km/h (40 mph)
on a staight FLAT road (no camber), check for
steering veer. The vehicle should follow a
straight path with NO tendency to follow a
curved path. If vehicle veers towards the kerb,
vehicle may be 'camber sensitive'. A small
amount of veer in direction of camber is
acceptable.
4.Directional stability assessment - drive at 112
km/h (70 mph) or maximum legal speed on a
straight flat road. Carry out a normal lane
change. Vehicle should quickly settle into a new
straight path.
5.Braking assessment (medium effort) - drive at 96
km/h (60 mph) on a straight flat road. Apply
steady medium braking effort, noting any
tendency to veer. Carry out brake test three
times, if a veer is consistently noted carry out a
braking efficiency test on a rolling road.
6.Braking assessment (full effort) - drive at 96
km/h (60 mph) on a straight flat road. Apply full
braking effort, noting any tendency to veer. Carry
out brake test three times, if a veer is
consistently noted carry out a braking efficiency
test on a rolling road.
If the symptom described by the customer is stiff
steering or steering niggle, carry out stiff steering
procedure
See Stiff Steering Checklist.
If not, proceed with basic checks and adjustments
See Visual Check and Basic Adjustments.

57STEERING
12
FAULT DIAGNOSISREV: 05/99 VISUAL CHECK AND BASIC ADJUSTMENTS
NOTE: It is important that the following
instructions are carried out in the
sequence shown and the results recorded.
1.Road springs - check that road springs are
correctly seated and are to correct specification
for vehicle. For spring specification
See
GENERAL SPECIFICATION DATA,
Information, Road Spring Data
.
2.Ride height - measure trim height from wheel
centre to wheelarch eyebrow. Record results on
data sheet.
3.Check/top up power steering fluid
See Repair,
Power Steering Fluid Reservoir
.
4.Check tension and condition of drive belt
See
ELECTRICAL, Repair, Auxiliary drive belt
.
5.Track rod/drag link - check condition of track rod,
drag link and ball joints
See Repair, Drag Link
and Drag Link Ends
.
If either component is damaged, check operation
of steering damper and steering box for
smoothness. Replace all damaged or worn
components that impair the operation of the
steering system.
6.Suspension bushes - examine all steering and
suspension bushes for signs of wear and
deterioration. Also check all fixings for torque
relaxation. Tighten to correct torque value
See
FRONT SUSPENSION, Specifications, torque,
Torque Values
.
7.Oil leaks - check front and rear axle hubs for
leak and repair as necessary.
8.Brake system - check brake system for leaks,
pipe condition, pad wear/contamination, disc
wear/condition.
9.Hub end float - check movement in the hubs by
rocking the wheels.
10.Check front wheel alignment. Vehicles displaying
a tendency to veer more than considered
allowable, it is permissible to set the front track
to parallel.11.Having completed all the above checks and
adjustments, road test vehicle
See Road Test
Procedure
.
Attempt to reproduce the symptoms established
earlier. If symptoms still exist refer to relevant
Diagnostic Chart.
STEERING LINKAGE INSPECT
NOTE: When inspecting steering linkages
and ball joints for wear the following items
must be checked.
Steering ball joints
1.Check ball joint rubber boots for security, signs
of cracking or deterioration.
2.Check ball joint assemblies for seizure i.e. no
movement on ball joint and associated
assemblies.
3.Check for excessive wear. This will be evident
as extreme movement on track rod and steering
linkages. Renew parts as necessary
See
Repair, Track Rod and Linkage
,See Repair,
Drag Link and Drag Link Ends
.
Steering linkages
1.Check all linkages for wear, deterioration and
damage. Renew parts as necessary
See
Repair, Track Rod and Linkage
,See Repair,
Drag Link and Drag Link Ends
.

STEERING
1
ADJUSTMENT POWER STEERING BOX - ADJUST
Service repair no - 57.35.01
WARNING: Adjustments of steering box
should not be required while in warranty
period. If box is stiff or tight and within
warranty, it must be returned to manufacturer. No
attempt must be made to introduce backlash.
1.Apply park brake brake, chock wheels and Jack
up front of vehicle until wheels are clear of
ground.
2.Support chassis front on axle stands.
3.Disconnect drag link from steering drop arm.
4.Check torque to turn
See Fault diagnosis,
Stiff Steering Checklist
.
5.Centralise steering box
See Centralise
Steering Box
.
NOTE: Only check for no backlash when
steering box is in central position.
NOTE: If steering wheel is not straight, it
should be repositioned
See Repair,
Steering Wheel
.
6.Adjustment is obtained by rocking the drop arm
about centre whilst an assistant slowly tightens
the steering box adjuster screw.
7.Tighten locknut when all backlash has been
removed.8.Repeat the check for backlash. If backlash exists
loosen locknut and repeat adjustment
procedure.
9.Turn steering wheel lock to lock and check no
tightness exists.
10.Ensure front wheels are aligned and in straight
ahead position.
11.Adjust drag link 924 mm between ball joint
centres.
12.Connect drag link and tighten to
40 Nm (30
lbf/ft).
13.Lower vehicle to ground level and remove
chocks.
14.Road test vehicle
See Fault diagnosis, Road
Test Procedure
.
Drag link adjust
1.RH drive vehicles - if steering wheel is to right,
drag link is too long. If steering wheel is to left
drag link is too short.
LH drive vehicles - if steering wheel is to right,
drag link is too short. If steering wheel is to left
drag link is too long.
2.Adjust drag link until steering wheel points
straight ahead when vehicle is travelling in a
straight line.
CENTRALISE STEERING BOX
Service repair no - 57.35.05
LH drive vehicle
1.Disconnect drag link from drop arm
See Repair,
Drag link and drag link ends
.
2.Turn steering wheel on full RH lock.
3.Turn steering wheel back exactly two turns.
4.Fit drag link
See Repair, Drag link and drag
link ends
.
RH drive vehicle
1.Repeat operation for LH drive vehicle but turn
steering wheel on full LH lock.

57STEERING
2
REPAIR
13.Disconnect 3 switch multi-plugs.
14.Slacken clamp screw on top of switch cluster
and withdraw switch assembly.
15.Note position of harness leads on back of starter
switch and disconnect lucars. If fitted, remove
alarm system passive coil from switch
See
ELECTRICAL, Repair, Vehicle immobilisation
and alarm system
.
16.Using a punch or stud extractor remove 2 shear
bolts securing switch to column.
17.Remove switch and collect 2 plain washers
between switch and clamp.
18.Remove brake pedal box
See BRAKES,
Repair, Brake pedal
.
19.Remove bolt securing tie-bar to steering column,
behind instrument panel.
20.Remove 2 bolts securing column lower support
to mounting bracket.
21.Remove bolts securing two halves of top clamp
and bolts that secure top half of clamp to
bulkhead.
22.Remove clamp and rubber packing.
23.Remove 2 bolts securing column main support
bracket to bulkhead.
24.Remove steering column and main support
bracket from vehicle.

STEERING
3
REPAIR REV: 05/99
NOTE: The steering column is a non
serviceable component and can only be
serviced as a complete assembly.
25.Fit main support bracket and padding to steering
column and manoeuvre column into position in
vehicle.
26.Loosely secure main support bracket and
harness bracket to bulkhead.
27.Loosely fit clamp and rubber packing strip to
column.
28.Loosely secure lower end of column to lower
support bracket.
29.Loosely secure clamp bracket to main support
bracket.
30.Working inside vehicle cab, fit tie-bar to column
bracket and secure with single bolt to
22 Nm (16
lbf/ft).
31.Finally, tighten main support bracket, clamp
bracket, upper clamp, and lower support bracket
nuts and bolts. (M6 bolts
9 Nm (6 lbf/ft),M8
bolts
22 Nm (16 lbf/ft).
32.Fit brake pedal boxSee BRAKES, Repair,
Brake pedal
.
33.Fit steering lock/switch in position and rotate
steering column inner shaft to line up slot with
switch plunger.
34.Secure lock to column with clamp and shear
bolts. Evenly tighten bolts but do not shear them.
35.Temporarily fit steering wheel and operate
switch and lock mechanism several times to
ensure it functions correctly.
36.Fully tighten switch retaining bolts until heads
shear.
37.Connect electrical leads to rear of switch. Fit
alarm system passive coil, if applicable.
See
ELECTRICAL, Repair, Vehicle immobilisation
and alarm system
.
38.Fit switch assembly on steering column and
tighten clamping screw.
39.Connect switch assembly multi-plugs and
electrical leads to main harness.
40.Offer up instrument panel, connect speedometer
cable, multi-plugs and electrical leads to main
harness. If applicable, fit vehicle alarm system
connections.
See ELECTRICAL, Repair,
Vehicle immobilisation and alarm system
.
41.Secure panel with 4 screws.
42.Locate top half of nacelle in position and fit to
switch gaiters/grommets.43.Fit lower half of nacelle and loosely tighten fixing
screws.
44.Ensure switch gaiters/grommets are correctly
located and fully tighten fixings.
45.Turn indicator cancelling ring so that slots are
vertical and lug with arrow points to the left, in
direction of indicator switch.
46.Fit steering wheel with finisher attachment lug at
bottom, ensuring that indicator cancelling forks
locate in cancelling ring slots.
47.Secure wheel with nut and new shake-proof
washer. Tighten to
43 Nm (32 lbf/ft).
48.Fit steering wheel decal.
49.If necessary, fit new universal joints to support.
Note that long joint is fitted to short length of
shaft and short joint to long end. Joints can only
be fitted one way to shaft.
50.With steering lock engaged and road wheels in
straight ahead position, align reassembly marks,
and fit collapsible shaft assembly with long leg of
shaft to steering box. Fit pinch bolts and tighten
to
25 Nm (18 lbf/ft).

57STEERING
4
REPAIR POWER STEERING BOX
Service repair no - 57.10.01
NOTE: A chassis undertray may be fitted
on some vehicle derivatives to conform to
legal requirements. When under chassis
remove and refit procedures are required, it may
be necessary to remove the undertray
See
CHASSIS AND BODY, Repair, Front undertray
.
General precautions
·Whenever any part of system, is removed or
disconnected, utmost cleanliness must be
observed.
·Disconnected ports and hoses must be
plugged to prevent ingress of dirt. If metal
sediment is found in system, establish cause,
rectify and flush system.
·Do not start engine until reservoir is full as
pump will be damaged.
·Metric pipe fittings are used with 'O' ring pipe
ends on fittings to steering box.
·Follow normal 'O' ring replacement procedure
whenever pipes are disconnected.
·Ensure compatible metric components when
fitting replacement pipes.
CAUTION: After refitting steering linkage
parts follow correct procedure to ensure
that road wheels, steering box and
steering wheel are correctly positioned relative to
each other when in straight ahead condition.
NOTE: When drag link is disconnected
from steering box, travel available at
steering wheel to each full lock is not
equal.
Remove
1.Site vehicle on level surface.
2.Apply park brake, chock rear wheels, raise
vehicle and locate axle stands. Alternatively,
raise vehicle on a hoist.
3.Remove road wheel.
4.Remove panhard rod
See FRONT
SUSPENSION, Repair, Panhard rod
.
5.Disconnect steering damper from drag link.
6.Disconnect drag link from drop arm, see J6305
on opposite page, using a suitable extractor.
7.Slacken, but do not remove nut securing tie bar
to mounting arm.8.Remove 2 bolts securing tie bar to steering box
and move aside.
9.Remove filler cap from power steering fluid
reservoir.
10.Position suitable container under steering box.
11.Disconnect feed and return pipes from steering
box and drain fluid.
12.Plug open pipes and steering box ports to
prevent ingress of dirt. Refit fluid reservoir filler
cap.
13.Centralise steering
See Centralise steering
box
.
14.Remove pinch bolt securing lower shaft
universal joint to power steering box.
15.Remove 4 bolts and 2 tab washers securing
steering box to chassis side member.
16.Withdraw steering box.
17.Clean all mounting faces, unions etc. prior to
refitting.
Refit
18.Position steering box to chassis side member,
ensuring locating peg is engaged. Fit tab
washers and tighten bolts to
81 Nm (60 lbf/ft).
19.Fit pinch bolt and nut securing universal joint to
power steering box spline. Tighten to
25 Nm (18
lbf/ft).
20.Secure tie bar to mounting arm and steering box.
Tighten fixings to
81 Nm (60 lbf/ft),starting with
tie bar to mounting nut, then loosen fixings by
one complete turn.
21.Check steering box and adjust if necessary
See
Adjustment, Power steering box - adjust
.
22.Refit drag link to drop arm and tighten nut to
40
Nm (30 lbf/ft).
Fit new split pin to retaining nut.

FRONT SUSPENSION
3
REPAIR REV: 05/99 Refit
11.Assemble shock absorber components.
12.Position shock absorber, complete with bracket
and secure with 4 fixings.
13.Secure shock absorber lower fixing.
14.Fit road wheel, remove chassis stands and jack.
Tighten wheel nuts to correct torque:
Alloy wheels -
130 Nm (96 lbf/ft)
Steel wheels -100 Nm (80 lbf/ft)
Heavy duty wheels -170 Nm (125 lbf/ft)
FRONT ROAD SPRING
Service repair no - 60.20.11.
Remove
1.Remove front shock absorber
See Front
shock absorber
.
CAUTION: Avoid over stretching brake
hoses. If necessary, loosen hose
connector locknuts to allow hoses to
follow axle.
2.Lower axle sufficient to free road spring.
3.Withdraw road spring.
4.Withdraw shock absorber bracket securing ring.
Refit
5.Fit shock absorber bracket retaining ring. Retain
in position with a nut.
6.Position road spring and raise axle.
7.Remove nut retaining securing ring.
8.Fit front shock absorber
See Front shock
absorber
.

REAR SUSPENSION
1
REPAIR REV: 05/99 REAR ROAD SPRING
Service repair no - 64.20.01.
Remove
1.Loosen rear road wheel retaining nuts.
2.Support chassis on stands and remove wheels.
3.Support rear axle weight with jack.
4.Disconnect shock absorbers at one end.
5.Position coil spring compressor correctly on road
spring.
6.Compress spring evenly to facilitate removal.
7.Lower axle to free road spring from upper seat.
CAUTION: Avoid lowering axle further than
rear brake flexible hose will allow.
8.Remove spring retainer plate.
9.Withdraw road spring.
10.Collect spring seat.
Refit
11.Position spring seat on axle location.
12.Fit road spring into chassis location and, using a
turning motion, fit to spring seat.
13.Fit spring retainer plate. Tighten bolts to
14 Nm
(10 lbf/ft).
14.Secure shock absorber. Tighten fixing to37 Nm
(27 lbf/ft).
15.Fit road wheels, remove chassis stands and
jack. Tighten wheel nuts to correct torque:
Alloy wheels -
130 Nm (96 lbf/ft)
Steel wheels -100 Nm (80 lbf/ft)
Heavy duty wheels -170 Nm (125 lbf/ft)
REAR SHOCK ABSORBER
Service repair no - 64.30.02.
Remove
1.Loosen road wheel retaining nuts.
2.Support chassis on stands. Remove road wheel
and support rear axle weight with jack.
3.Remove fixings and withdraw shock absorber
from axle bracket.
4.Remove upper fixings.
5.Withdraw shock absorber.
6.If required, remove mounting bracket
7.If required, remove mounting rubbers.
Refit
8.Position shock absorber and fit upper fixings.
9.Secure shock absorber with lower fixings to axle
bracket. Tighten upper and lower fixings to
37
Nm (27 lbf/ft).
10.Fit road wheels, remove chassis stands and
jack. Tighten wheel nuts to correct torque:
Alloy wheels -
130 Nm (96 lbf/ft)
Steel wheels -100 Nm (80 lbf/ft)
Heavy duty wheels -170 Nm (125 lbf/ft)

BRAKES
1
DESCRIPTION AND OPERATION DESCRIPTION
The mechanical components of the hydraulic braking
system consists of four piston caliper disc brakes at
the front and two piston caliper disc brakes at the rear.
Vented front brake discs are fitted as standard on
110/130 models, while 90 models have solid discs.
However, on 90 models with a heavy duty chassis,
vented front discs may also be fitted.A cable controlled parking brake operates a single
drum brake mounted on the output shaft of the
transfer gearbox and is completely independent of the
main braking system.
The basic hydraulic system involves 2 separate and
independent primary and secondary circuits which
permits a degree of braking should a fault occur in
one of the circuits. The primary circuit operates the
rear brake calipers and the secondary circuit the front
brake calipers.
Master cylinder components
1.Secondary plunger
2.Secondary spring
3.Recuperation seal4.Primary spring
5.Recuperation seal
6.Primary plunger