brakes JAGUAR XJ6 1994 2.G Owner's Manual

Brakes
a 12.5 GENERAL FI77lNG lNSTRUCTlONS
12.5.1 Brake Fluid
WARNING: BRAKE FLUID IS CORROSIVE. EXTREME CARE MUST BE TAKEN WHEN HANDLING. AVOID SKIN OR EYE
CONTACT. AVOID INGESTION. IF SKIN OR EYES ARE ACCIDENTALLY SPLASHED WITH BRAKE FLUID,
RINSE THE AFFECTED AREA IMMEDIATELY WITH PLENTY OF WATER AND SEEK MEDICAL ATTENTION.
IF BRAKE FLUID
IS INGESTED, SEEK MEDICAL ATTENTION IMMEDIATELY.
CAUTION:
Fluid must not be allowed to contact the vehicle paintwork. Remove any spilt fluid from the paintwork
by rinsing away with running water. Methylated spirit (denatured alcohol) must not be used to clean the
contaminated area.
Cleaning Solvents
CAUTION: Never use methylated spirit (denatured alcohol) for cleaning purposes. Use only a proprietary brake
cleaning fluid.
m: THROUGHOUT THE FOLLOWING MAINTENANCE / SERVICE OPERATIONS, ABSOLUTE CLEANLINESS
MUST BE OBSERVED TO PREVENT GRIT OR OTHER FOREIGN MATTER CONTAMINATING THE BRAKE
TION. TO CLEAN BRAKE SYSTEM COMPONENTS, WASH
IN A PROPRIETARY BRAKE CLEANING FLUID.
REMOVE ALL TRACES OF CLEANING FLUID BEFORE REASSEMBLY. ALL BRAKE SYSTEM RUBBER COh PONENTS MUST BE DIPPED IN CLEAN BRAKE FLUID AND ASSEMBLED USING THE FINGERS ONLY.
SYSTEM.
IFTHE SYSTEM IS TO
BE FLUSHED, USE CLEAN BRAKE FLUID TO MINIMUM DOT 4 SPECIFICA-
12.5.2 Hoses
Fully release the unions (1 Fig. 1) securing each end of the
hose to the fluid pipes. Withdraw the pipe unions (1 Fig. 1) from the hose ends.
Plug the ends of the pipes (2 Fig. 1) to prevent the loss of
fluid and the ingress of dirt.
Remove the mounting bracket locknut (3 Fig. 1) and re- move the hose (4 Fig. 1).
Thoroughly clean the hose and examine for any signs of
wear or damage. Renew the hose if there is any doubt
about its condition. Thoroughly clean the bore of the hose
using compressed air.
. Remove all blanking plugs and fit the new hose to the cali- per / connector. Secure the hose to the mounting bracket.
. Before fully tightening the locknut, ensure that the hose is
neither kinked nor twisted.
. Bleed the brakes.
12.5.3 Pipes
. Fully release the pipe unions (1 Fig. 1).
. Withdraw the pipe (5 Fig. 1) from the vehicle. Plug the
pipes (2 Fig. 1) to prevent the loss of fluid or the ingress of dirt. Thoroughly clean and examine the pipe for signs of damage or deterioration. Renew the pipe if there is any
doubt about its condition.
Thoroughly clean the bore of the pipe using compressed
air.
. Remove all blanking plugs and fit the new pipe to the ve- hicle. Secure the pipe to the body.
. Bleed the brakes.
17
Fig. 1
X300 VSM 21 Issue 1 August 1994

Brakes
12.7 HYDRAULICCONTROL MODULE- RENEW
SRO 70.60.18
70.60.1
9
Refer to Section 12.4, Brake System Bleeding before carrying out this procedure. Pay particular attention to the warn- ings and cautions relating to brake fluid, cleanliness and cleaning materials.
W: The illustration shows the hydraulic control module of a 6 cyl. vehicle with traction control. Hydraulic control
modules on non-traction control vehicles have only three outlet ports. Apart from this, the removal procedure
is the same for all vehicles.
. Raise the vehicle.
Displace the bleeder screw dust cap of the front LH caliper.
The dust cap will remain captive
on the bleed screw.
. Connect a bleeder tube and bottle to the bleeder screw (1
Fig. 1) and open the bleeder screw.
. Fit a brake pedal hold-down tool (JDS-9013) between the
brake pedal and the steering wheel. Adjust the tool to op
- erate the brake pedal 60mm down. This operation is
necessary to prevent fluid loss from the reservoirthrough
. Re-tighten the front LH caliper bleeder screw. Disconnect
the bleeder tube from the bleeder screw and remove the
tube and bottle. Refit the bleeder screw dust cap.
Undo the securing bolt of the multi-plug connector (1 Fig. 2). The bolt will remain captive. Disconnect the multi-plug
connector and reposition safely.
. Place absorbent material underneath the hydraulic con-
trol module to absorb any spillages.
Undo the tandem master cylinder CTMC) brake pipe gland
nuts (2 Fig.2) and disconnect the brake pipes.
. Fit plugs immediately to the brake pipes and the hydraulic
control module to prevent fluid
loss.
. Undo the rear brake pipe gland nuts (3 Fig. 2) at the pres- sure conscious reducing valves (PCRVs) (4 Fig. 2). Remove
the rear brake pipes.
disconnected brake pipes.
Note: Take necessary steps to prevent rotation of the
PCRVs when removing the rear brake pipes.
Fit plugs immediately to the brake pipes and the PCRVs to
. Undo and remove the PCRVs. Fit plugs immediately to the
Place PCRVs aside to be fitted later to the new hydraulic
. Undo the front brake pipe gland nuts (5 Fig. 2) and remove
. Fit plugs immediately to the brake pipes and the hydraulic
. Undo and remove the three securing nuts (6 Fig. 2) and re-
0 prevent fluid loss.
PCRVs and the hydraulic control module.
control module.
the front brake pipes.
control module to prevent fluid
loss.
move the hydraulic control module. Fia.
1
3 1 J70 296
Fia. 2
Issue 1 August 1994 X300 VSM 23

Brakes
12.8
SRO 70.60.21
PRESSURE CONSCIOUS REDUCING VALVES - RENEW
Refer to Section 12.4, Brake System Bleeding before carrying out this procedure. Pay particular attention to the warn- ings and cautions relating to brake fluid, cleanliness and cleaning materials.
Note: The illustration shows the hydraulic control module of a 6 cyl. vehicle with traction control. Hydraulic control
modules on non-traction control vehicles have only three outlet ports. Apart from this, the removal procedure
is the same for all vehicles.
. Raise the vehicle.
Displace the bleeder screw dust cap of the front LH caliper.
The dust cap will remain captive on the bleed screw.
rn Connect a bleeder tube and bottle to the bleeder screw (1 Fig. 1) and open the bleeder screw.
Fit a brake pedal hold-down tool (JDS-9013) between the
brake pedal and the steering wheel. Adjust the tool to op- erate the brake pedal 60mm down. This operation is
necessary to prevent fluid
loss from the reservoir through
disconnected brake pipes.
. Re-tighten the front LH caliper bleeder screw. Disconnect
the bleeder tube from the bleeder screw and remove the
tube and bottle. Refit the bleeder screw dust cap.
rn Place absorbent material underneath the hydraulic con- trol module to absorb any spillages.
. Undo the rear brake pipe gland nuts (1 Fig. 2) at the pres- sure conscious reducing valves (PCRVs) (2 Fig. 2). Remove
the rear brake pipes.
m: Take necessary steps to prevent rotation of the
PCRVs when removing the rear brake pipes.
Fit plugs immediately to the brake pipes and the PCRVs to
Undo and remove the PCRVs. Fit plugs immediately to the
. Clean the surrounding area.
. Fit new PCRVs to the hydraulic control module, removing
plugs immediately priorto connection. Tighten the PCRVs.
. Connect the rear hydraulic brake pipes to the PCRVs, re- moving the plugs immediately prior to connection.
Tighten the gland nuts.
prevent
fluid loss.
PCRVs
and the hydraulic control module.
0
Note: Take necessary steps to prevent rotation of the
PCRVs when fitting the rear brake pipes.
. Removethe absorbent material and clean the surrounding
. Ensure that all fixings are torque tightened to specified tol-
Release the brake pedal hold-down tool and remove.
. Bleed the brake system (refer to sub-section 12.4.4).
. Examine the hydraulic control module for leaks.
area.
erances. Fia.
1
Fia. 2
X300 VSM 25 Issue 1 August 1994

e LmmJ
Power assisted, ventilated discs,
sliding calipers: FN60 single piston
60mm Power assisted, ventilated discs,
FN48 single piston sliding calipers
48mm Mechanical, operating
on rear
drums within bell of the rear brake
discs.
291mm
305mm
28mm. wear limit 27mm
20mm, wear limit 18,5mm
Vacuum power, hydraulic operation
Bore diameter:
25,4mm
Jurid 518
Jurid 101
Ferodo 3612
6,51 vacuum
Electrical inductive sensors at the
wheels which detect rotational
speed.
Hydraulic: vehicles
with traction
control - contains four solenoid
valves, one for each wheel; vehicles
without traction control
- contains
three solenoid valves, one for each front wheel and one for both rear
wheels.
Solid state digital
unit (integral with hydraulic module).
Specification
Braking System
Front brakes: all vehicles.. ........ .................... ........... ...
Caliper piston diameter: ..........
Rear brakes: all vehicles ..........
...
...
....................
....................
...........
...........
Caliper piston diameter ...........
Parking brake ....................
...
...
....................
....................
...........
...........
Disc diameter:
Front
.........................
Rear .........................
Front .........................
Rear .........................
Brake operation .................
Master cylinder ..................
Main brake friction pad material:
Front
........................
Rear ........................
Parking brake friction shoe material
Brake
servo booster assembly
Boost ratio
......................
Disc thickness:
...
... ....................
....................
...........
...........
...
...
...
...
....................
....................
....................
....................
...........
...........
...........
...........
...
...
.. ....................
....................
....................
...........
...........
...........
... .................... ...........
Anti-lock braking system (ABSI
Wheel sensors ................... ... .................... ...........
ABS modulator .................. ... .................... ...........
0
0
Control module type ............. ... .................... .........
Issue 1 August 1994 X300 VSM AI-95MY 3

General Fitting Instructions
Pressordrifttheseal in tothefull depthofthe housing ifthe housing is shouldered,orflush withthefaceofthe housing
where no shoulder is provided.
Note: Careless fitting of oil seals, which can result in damage to the seal and sealing surfaces, accounts for most
cases of failure of seals. Care in fitting is essential
if good results are to be obtained.
A3.2.7 joints And joint Faces
Remove all traces of old jointing materials prior to reassembly. Inspect joint faces for scratches or burrs and remove
with a fine file or oilstone; do not allow swarf or dirt to enter tapped holes or enclosed parts. Blow out any pipes, chan- nels or crevices with compressed air, refitting or renewing any 0-rings or seals which have been displaced by the com- pressed air.
Always use the specified gaskets. Use jointing compound only when recommended, otherwise fit joints dry. When
jointing compound is used, apply in
a thin film to metal surfaces; take great care to prevent it from entering oilways, pipes or blind tapped holes.
A3.2.8
Before removing a hose from the brake or power steering systems, thoroughly clean the end fittings and the area sur- rounding them. Obtain blanking caps beforedetaching hosefittings,sothat portscan becovered to excludedirt. Clean
the hose externally and blow through with compressed air. Examine the hose carefully for cracks, separation of plies,
security of end fittings and external damage. Reject any hose found to be faulty. When refitting the hose, ensure that
no unnecessary bends are introduced and that the hose is not twisted before or during tightening of union nuts.
Do not store hydraulic fluid in an unsealed container because it will absorb water. Fluid in this condition would be dan- gerous to use due to a lowering of its boiling point. Do not allow hydraulic fluid to be contaminated with mineral oil,
or use a container which has previously contained mineral oil.
Do not re-use fluid bled from the system. Always use clean brake fluid, or a recommended alternative, to clean the
hydraulic components. Fit a blanking cap to the hydraulic union and
a plug to its mating socket, after removal from
the vehicle, to prevent ingress of dirt. Absolute cleanliness must be observed with hydraulic components at all times.
After any work has been performed on hydraulicsystems, inspect carefully for leaks underneath the car while a second
operator applies maximum pressure to the brakes (with the engine running) and operates the steering.
Hydraulic Flexible Pipes And Hoses
A3.2.9 Metric
Bolt Identification
An IS0 metric bolt or screw, made of steel and larger than
6mm in diameter can be identified by the symbols ISOM or M embossed on top of the head (Fig. 1 ). In addition to marks
to identify the manufacturer, the head is also marked with
symbols to indicate the strength grade eg
8.8, 10.9, 12.9 or 14.9. The first figure gives the minimum strength of the bolt
material in tens of kgf / mm2. Zinc plated IS0 metric bolts
and nuts are chromate passivated and coloured greenish- khaki to gold-bronze.
A3.2.10 Metric Nut Identification
A nut with an IS0 metricthread is marked on one face (1 Fig. 2) or on one of the flats (2 Fig. 2) of the hexagon with the
strength grade symbol 8, 12 or 14. Some nuts with a
strength 4,5 or 6 are also marked and some have the metric
symbol M on the flat which is opposite to the strength grade
marking.
Aclockfacesystem is used as an alternative method of indi
- cating the strength grade (3 Fig. 2). The external chamfers
or a face of the nut is marked in a position relative to the ap-
propriate hour mark on a clock face to indicate the strength
grade. A dot is used to locate the 12 o’clock position and a dash to indicate the strength grade. If the grade is above 12,
two dots identify the 12 o’clock position. Fig.
1
I I
Fig. 2
X300 VSM Issue 1 August 1994 4