light LAND ROVER DISCOVERY 1995 Repair Manual

BRAKES
9
REPAIR SERVO ASSEMBLY
Service repair no - 70.50.01
Remove
Before starting repair refer to general brake service
practice.
See General Brake Service Practice
NOTE: The filter, non-return valve and
grommet, are the only serviceable
components, in event of failure or damage
fit a new unit.
1.Disconnect battery negative lead.
2.Disconnect electrical plug to low fluid level
switch.
3.Thoroughly clean immediate area around all
master cylinder outlet ports. Remove each brake
pipe, sealing each pipe and outlet port to prevent
ingress of foreign matter.
4.Disconnect vacuum supply hose to servo.
5.Remove lower dash panel to gain access to
servo push rod to brake pedal.
6.Remove clevis pin securing servo push rod to
brake pedal.
7.Remove two nuts and plain washers securing
servo.
8.Remove servo and master cylinder assembly.
9.Drain brake fluid into a suitable container. (If
master cylinder is kept horizontal it is not
necessary to drain fluid).10.Detach spacer from pedal box mounting face of
servo.
NOTE: Retain spacer for reassembly. The
spacer ensures stringent pedal to servo
operating dimensions are maintained.
11.Remove master cylinder from existing servo and
refit to new servo, if fitting new unit.
Refit
12.Fit spacer to servo.
13.Fit servo to pedal box.
14.Lightly grease brake pedal around area servo
push rod pivots.
15.Fit push rod to lower hole of brake pedal. Fit
clevis pin and clip.
16.Secure servo with two nuts and plain washers.
Tighten nuts to
26 Nm.
17.Refit lower dash panel.
18.Fit master cylinder to servo, refit nuts, plain and
spring washers. Tighten nuts to
26 Nm.
19.Remove all sealing plugs. Refit brake pipes to
respective ports. Tighten brake pipes to
15 Nm.
20.Refit vacuum supply hose.
21.Fill master cylinder to correct level using correct
grade of brake fluid.
See LUBRICANTS,
FLUIDS AND CAPACITIES, Information,
Recommended Lubricants and Fluids
22.Bleed brake system.See Brake System Bleed

70BRAKES
18
REPAIR SENSORS - FRONT
Service repair no - 70.65.32
CAUTION: If a sensor is removed for any
reason, a NEW sensor bush and seal must
be fitted.
Remove
1.Disconnect battery negative lead.
2.Disconnect required sensor electrical
connection, located on inner wing [fender] panel.
3.Remove sensor lead from clips.
4.Clean area surrounding sensor to prevent
ingress of dirt. Using a suitable lever pry sensor
from mounting bush.
5.Release harness cable ties, remove sensor lead
from vehicle.
6.Remove top swivel retaining bolts complete with
brake jump hose and sensor seal. Remove
sensor bush.
Refit
7.Insert new sensor bush and seal.
8.Refit brake jump hose bracket, coat bolts with
Loctite 270.
9.Lightly coat new sensor using EP 90 oil. Push
sensor through bush until it contacts exciter ring.
Sensor will be 'knocked back' to correct position
when vehicle is driven.
10.Secure sensor lead in original position.
11.Reconnect sensor electrical connection.
12.Drive vehicle to ensure ABS warning light is
extinguished.
SENSOR RINGS
The rear sensor ring is assembled to the rear brake
disc to form part of the rear hub assembly.
See
REAR AXLE AND FINAL DRIVE, Repair, Rear Hub
Assembly
The front sensor ring is a toothed ring on the axle
shaft which forms part of the front stub axle assembly.
See FRONT AXLE AND FINAL DRIVE, Overhaul,
Front Stub Axle, Constant Velocity Joint and
Swivel Pin Housing ABS

BRAKES
19
REPAIR SENSORS - REAR
Service repair no - 70.65.31
CAUTION: If a sensor is removed for any
reason, a NEW sensor bush must be fitted.
Remove
1.Disconnect battery negative lead.
2.Disconnect sensor electrical connections,
located above rear axle.
3.Remove sensor from its locating clip.
4.Remove bolts securing mudshield.
5.Using a suitable lever, pry sensor from mounting
bush.
6.Release harness cable ties, remove sensor lead
from vehicle.
7.Remove sensor bush.
Refit
8.Fit new sensor bush.
9.Lightly grease new sensor using silicone grease.
See LUBRICANTS, FLUIDS AND
CAPACITIES, Information, Recommended
Lubricants and Fluids
10.Push sensor through bush until it touches exciter
ring. Sensor will be 'knocked back' to correct
position when vehicle is driven.
11.Secure harness in position.
12.Reconnect sensor electrical connection.
13.Drive vehicle to ensure ABS warning light is
extinguished.STOP LIGHT SWITCH ABS
Service repair no - 86.65.51
Remove
1.Turn ignition off. Disconnect battery negative
lead.
2.Remove lower trim panel.
3.Disconnect multiplug to switch.
4.Depress brake pedal access front of switch.
5.Pull sleeve and plunger of switch FULLY
forward.
6.Remove switch rearwards
NOTE: If switch is difficult to release,
check sleeve is FULLY forward.
Refit
7.Pull sleeve and plunger of switch fully forward.
8.Depress brake pedal, fit switch. Ensure retaining
clips are FULLY located.
9.Hold switch firmly in place, pull brake pedal back
fully to set switch.
10.Reconnect battery and turn ignition on.
11.Check switch operation by slowly depressing
brake pedal and checking that the switch clicks
twice.
12.Check stop lamps go off when pedal is released.
13.Recheck switch is securely fitted.
14.Operation may be checked using Testbook.

70BRAKES
20
REPAIR STOP LIGHT SWITCH - NON ABS
Service repair no - 86.65.51
Remove
1.Disconnect battery negative lead.
2.Remove lower dash panel.
3.Depress foot brake.
4.Remove rubber protector from switch, if fitted.
5.Remove hexagon nut.
6.Withdraw switch.
7.Disconnect electrical leads.
Adjust
8.With switch still in position and multiplug
disconnected, connect an ohmmeter across
switch terminals.
9.Screw switch in until open circuit exists across
terminals with pedal released and continuity
exists as soon as pedal is depressed.
10.Tighten locknut.
CAUTION: Ensure switch does not prevent
brake pedal returning fully.
Refit
11.Reverse removal procedure.

74WHEELS AND TYRES
6
REPAIR WHEELS
Remove
WARNING: The parking brake acts on
transmission, not rear wheels, and may
not hold vehicle when jacking unless
following procedure is used. If one front wheel
and one rear wheel is raised no vehicle holding or
braking effect is possible. Wheels MUST be
chocked in all circumstances.
Apply parking brake, select 'P' or a gear in main
gearbox and engage low gear in transfer box.
1.Loosen five wheel nuts.
2.Using a suitable trolley jack raise vehicle and
place on axle stands.
See INTRODUCTION,
Information, Jacking
3.Remove wheel nuts and carefully withdraw
wheel over studs.Refit
4.Ensure that retaining studs and nuts are clean.
5.Alloy wheels: Lightly coat wheel mounting spigot
face with a suitable anti-seize compound to
minimise possibility of adhesion between wheel
and spigot face.
6.Refit wheel taking care not to damage stud
threads. (Do not apply oil)
7.Fit wheel nuts and turn by hand for at least three
full threads before using any form of wheel
wrench.
8.Tighten nuts as much as possible using a
suitable wrench.
9.Lower vehicle and finally tighten nuts to correct
torque sequence shown. Alloy wheels and steel
wheels:
130Nm.

SUPPLEMENTARY RESTRAINT SYSTEM
1
DESCRIPTION AND OPERATION SYSTEM COMPONENTS
1. Airbag crash sensors (distributed SRS)
2. SRS warning light (airbag)
3. Rotary coupler
4. Driver's airbag module
5. Passenger's airbag module6. Airbag diagnostic socket
7. Airbag diagnostic control unit
8. Airbag harness (distributed SRS)
9. Knee bolsters (where fitted)
10. Airbag harness

SUPPLEMENTARY RESTRAINT SYSTEM
3
DESCRIPTION AND OPERATION SRS warning light (airbag)
Distributed SRS
The warning light in the instrument pack illuminates
after the electrical circuits are switched on whilst a
system check is carried out. After about 8 seconds the
warning light will go out. The system checks airbag
diagnostic control unit, airbag crash sensors, airbag
harness, driver and passenger modules.
SPS SRS
The warning light in the instrument pack illuminates
after the electrical circuits are switched on whilst a
system check is carried out. After about 5 seconds the
warning light will go out. The system checks airbag
diagnostic control unit, airbag harness, driver and
passenger modules.
All Models
In the event of a fault in the system the warning light
will illuminate. The airbag diagnostic control unit logs
the fault which can only be accessed using TestBook.

SUPPLEMENTARY RESTRAINT SYSTEM
7
REPAIR ROTARY COUPLER CENTRALISE
Fitting a rotary coupler which has not been centralised
could result in tape breakage. If the tape is broken, a
new rotary coupler must be fitted.
Providing the removal procedure has been correctly
followed this operation should not be necessary. If
however there is evidence of tampering, it is
imperative that the coupler is centralised.
CAUTION: Ensure wheels are positioned
straight ahead before fitting the rotary
coupler.
1.Correctly fit rotary coupler to column switch
assembly but do not fit steering wheel or make
any electrical connections.
See rotary coupler.
2.Depress rotary coupler locking peg and without
using undue force, rotate coupler anti-clockwise
as far as inner tape will allow. Releasing peg will
lock coupler in its current position.
NOTE: Do not apply excessive force when
limit is reached as this may result in tape
breakage. If no limit can be found, tape
has already broken and rotary coupler must be
replaced.
3.Having turned rotary coupler fully anti-clockwise
to limit position, proceed to turn coupler 2.5 turns
clockwise to obtain central position. (Coupler will
normally rotate a full five turns from
anti-clockwise limit to clockwise limit).
4.Make necessary electrical connections and refit
steering wheel.
See steering wheel.
5.Refit driver's airbag module.See driver's
airbag module.
COLUMN SWITCH ASSEMBLY
Service repair no - Indicator/lighting - 86.65.55
Service repair no - Wash/wipe - 84.15.34
Remove
1.Remove steering wheel.
See steering wheel.
2.Release 2 turnbuckles and remove lower dash
panel.

75SUPPLEMENTARY RESTRAINT SYSTEM
12
REPAIR SRS WARNING LIGHT BULBS
Service repair no - 76.73.74
Remove
1.Remove instrument binnacle.
See
ELECTRICAL, Repair, instrument binnacle.
2.Remove window and face plate from instrument
panel.
3.Remove 3 screws securing ECU to instrument
panel.
4.Release and remove small cover from ECU.
5.Disconnect multiplug from ECU.
6.Remove ECU
7.Remove 4 screws securing tachometer.
8.Remove tachometer.

SUPPLEMENTARY RESTRAINT SYSTEM
13
REPAIR
9.Carefully remove 2 screws securing face plate to
tachometer.
10.Release warning light housing from tachometer
circuit board.
11.Carefully (to avoid damage to tachometer needle
and spindle), tilt and remove warning light
housing.
12.Remove 2 warning light bulbs.Refit
13.Reverse removal procedure.
14.Fit new warning light bulbs.
15.Carefully fit warning light housing, ensuring that
locating pegs engage correctly and that retaining
clips lock housing into position.
16.Ensure that tachometer needle is on the correct
side of its stop.
17.Fit instrument binnacle.
See ELECTRICAL,
Repair, instrument binnacle.