brake JAGUAR X308 1998 2.G Workshop Manual

Rear
Disc Brake - Rear Disc Brake
Description an
d Operation

The brake disc is mounted on the wheel studs and is clamped between the wheel and hub. Cooling ducts run through the
center of the brake disc to provide the required ventilation to keep the disc cool under operating conditions.
The caliper carrier, which is se cured to the hub carrier by two bolts, carries the single-piston caliper housing. The caliper
housing is secured to the caliper carrier by two guide-pins and an anti-rattle spring. When the brakes are applied the
caliper-housing piston pushes th e brake pad in front of it, towards the brake di sc. This movement forces the caliper housing
to move along the guide-pins, in the oppo site direction of the piston, to apply the second brake pad. The brake disc is
therefore gripped between the two pads. As brake pressure is increased the grip on the brake disc is increased to slow-down
the rotation of the road wheel.
The disc brakes requ ire no adjustment.
It
em
Par
t Number
De
scription
1—B

rake Disc
2—Caliper Housin

g
3—Caliper Carrier
4—Brake Pad

s
5—Guide P

ins

6—Du
st Covers
7—An

ti-rattle Spring
8—Du

st Shield
9—Brake Hos

e
10—Bleed Nipp

le

CAUTI O
N: The Brembo caliper is aligned to
the brake disc when it is first installed to the vehicle, therefore, care must
be taken not to disturb this alignment. When removing the ca liper; remove the bolts that secure the anchor bracket to the
hub carrier only. DO NOT loos en any other caliper bolts.
Brembo calipers and discs provide higher -performance braking using the existing hydraulic braking system. The brakes are
installed to the vehicle using unique hub carr iers, hubs, hydraulic hoses and disc shields.
The rear brake disc is a single piece co nstruction which is ventilated and cross-drilled. The disc is mounted on the wheel
studs and is clamped between the wheel and hub. Cooling ducts run through the ce nter of the brake disc to provide the
required ventilation to keep the disc cool under operating conditions.
Modified disc shields are installed to accommodate the larger diameter discs.
Due to the use of fixed calipers in place of the standard floating caliper, certain lateral dimensions on the hub carriers and
hubs are critical to achieve correct cleara nce and operation of the brakes. Therefore special hub carriers and hubs set within
a certain tolerance are inst alled with Brembo brakes.
The four cylinder brake caliper is rigidly attached to the vert ical link via an anchor bracket. The caliper is a split assembly
with each side of the caliper, housing two pistons. The two-pairs of opposed pistons act direct ly on the brake pads mounted
one each side of the disc.
It e
m
Par
t
Number
De
scr
iption
1—Brake D
i
sc
2—Caliper Housin
g
3—Anchor Bracke
t
4—Anchor Bracket to H
u
b Carrier - Bolts
5—Brake Pads


6—Guide Pi

ns
7—An
ti
-rattle Sprin
g
8—Di
sc
Shield
9—Brake Hos
e

10—Bleed Nipp
les

Rear Disc Brake - Brembo

Stai
nless steel hydraulic hoses connect the calipers to the existi
ng brake tubes. It is important that these hoses are aligned
correctly when installed to pr event them fouling on the steering and suspen sion components. Refer to operation 70.55.25
for information.
The Brembo disc brakes require no adjustment.

Rear Disc Brake - Brake CaliperVehicles W
ith: Standard Brakes
Re
mo
val and Installation
Remov
a
l
WA
RNING: BRAKE DUST, IF INHALED CAN DAMAGE YOUR
HEALTH. ALWAYS REMOVE BRAKE DUST USING A VACUUM
BRUSH. DO NOT USE A COMPRESSED-AIR LINE TO DISPERSE BRAKE DUST INTO THE ATMOSPHERE.
• CAUTIONS:
Replacement of nuts and bolts: Various thread-locking de vices are used on nuts and bolts throughout the vehicle.
These devices restrict the number of times a nut or bolt can be used. See section 100-00 for information.
Remove brake fluid spilla ge immediately from paint work, with clean water.
The brake pad adhesive backing must not be reused, therefore always install new brake pads, irrespective of the
condition of the original pads when replacing a brake caliper. Always replace brake pads as an axle set.
Sp
ecial Tool(s)

Brake Pedal
H
old Tool
JDS 9013
1. Op
en luggage compartment lid and fit suitable paintwork
protection equipment.
2. Raise vehicle on a four-post lift.
3. Raise rear of vehicl e and support on stan ds. See Section 100-
02.
4. Remove rear wheel. See Section 204-04.

5. NOTE
: Th
e following three pictorial procedures must be
carried-out to minimize brake fl uid loss when disconnecting the
brake hose.
Open Left-Hand-Front and Left-H and-Rear caliper bleed nipples.
Connect a
bleed tube and co
ntainer to the calipers.
Op
en bleed nipples.
6. Depress and hold down brak e pedal at the specified
measurement using the special tool.
1. Position tool between brake pedal and seat frame.
2. Turn the tool wheel unti l the brake pedal is held
60mm down from its released position.

7. Close bleed nipples on
both calipers.
Remove bleed tub

es and containers.
Tigh

ten front bleed nipple to 4-6 Nm.
Tigh

ten rear bleed nipple to 8-11 Nm.

8. Di
sconnect brake hose from
rear caliper housing.
Install plugs to caliper
and brake hose.

9. R
emove caliper housing from caliper carrier.
1. Remove anti-rattle spring.
2. Remove dust covers.
3. Remove guide pins.
4. Remove housing from carrier.
10. NOTE: The inner brake pad is fitt ed with a clip which secures
the pad into the caliper piston.
Remove and discard brake pa ds. (See Caution above).

In
stallation


11
. R
emove caliper carrier from hub carrier.
Re
mo
ve bolts.
R
e
move carrier.
12. Clean all mating surfaces and remove brake dust. See
Warning above.

1. Inst al
l caliper carri
er to hub carrier.
Align c
arrier to hub carrier.
Install and tighten bolts to 6

0 Nm.

2. Make sure piston i
s
fully re
tracted into caliper housing.
R
e
move plug from caliper housing.
Re
tr
act piston.
3. Install brake pads in to caliper housing. (See Caution above).
Remove paper backing from pads to reveal adhesive shi
m.
Install brake pads, in sert clip located on back of inner pad

into caliper piston.

4. Inst
all caliper housing to caliper carrier.
1. Align housing to carrier.
2. Install and tighten gu ide pins to 25-30 Nm.
3. Install dust covers.
4. Install anti-rattle spring.

5. Conne
ct brake hose to caliper housing.
Re

move plugs.
Install and tigh

ten bolt to 30-40 Nm.
6. Remove special tool from brake pedal.
7. Fit wheels. See Section 204-04.
8. Remove stands and lower vehicle. See Section 100-02.
9. Bleed brake hydraulic system. Refer to operation 70.25.03.

Rear Disc Brake - Brake CaliperVehicles With: High Performance Brakes
Remo
val and Installation
Remov
a
l
S
p
ecial Tool(s)

Brake Pedal
H
old Tool
JDS 9013
1. WARNING: BRAKE DUST, IF INHALED CAN DAMAGE
YOUR HEALTH. ALWAYS REMOVE BRAKE DUST USING A VACUUM
BRUSH. DO NOT USE A COMPRE SSED-AIR LINE TO DISPERSE
BRAKE DUST INTO THE ATMOSPHERE.
• CAUTIONS:
Replacement of nuts and bolts: Various thread-locking
devices are used on nuts and bolts throughout the vehicle. These
devices restrict the number of ti mes a nut or bolt can be used.
See section 100-00 for information.
Remove brake fluid spillage immediately from paint work,
with clean water.
The Brembo caliper is aligned to the brake disc when it is
first installed to the vehicle, therefore, care must be taken not to
disturb this alignment. When removing the caliper; remove the
bolts that secure the anchor brac ket to the hub carrier only. DO
NOT loosen any other caliper bolts.
Open engine compartment and fit paint work protection covers
to fenders.
2. Raise
vehicle on a four-post lift.
3. Raise front of vehicle and support on stands. Refer to Section
100-02.
4. Remove front wheels. Refe r to operation 74.20.05.

5. NOTE : Th
e following three pictorial procedures must be
carried-out to minimize brake fl uid loss when disconnecting the
brake hose.
Open Left-Hand-Front and Left-H and-Rear caliper bleed nipples.
Connect a
bleed tube and co
ntainer to the calipers.
Op
en bleed nipples.
6. Depress and hold down brak e pedal at the specified
measurement using the special tool.

1
. Position tool between
brake pedal and seat frame.
2. Turn the tool wheel unti l the brake pedal is held
60mm down from its released position.

7. Close bleed nipples on
both calipers.
Tigh

ten bleed nipples to 12-16 Nm.
Remove bleed tub

es and containers.

8. R
elease brake hose from caliper.
R

emove union bolt.
Remove an

d discard
sealing washers.
Inst
all plugs into caliper and hose.

9. Remove brake
pads from caliper.
1. Withdraw pins from caliper.
2. Remove anti-rattle spring.
3. Remove brake pads.
10. CAUTION: Only remove the bolts securing the caliper
anchor bracket to the hub carrier. Refer to caution above for more
information.
Remove caliper from hub carrier.
Re
move bolts.

In
stallation

11
. Remove brake
dust and clean
mating surfaces. See Warning
above.

1. Inst al
l caliper to hub carrier.
Install and tigh
ten bolts to 6
0 Nm.

2. CAUTI O
NS:
Retracting the caliper piston may cause the fluid reservoir
to over-flow. Remove brake flui d spillage immediately from paint
work with clean water.
Note the condition of the pi ns and replace if necessary.
Install brake pads. Refer to 70 .40.09 for anti-squeal grease
application.
Sl owly
retract caliper pistons.
1. Install pads.
2. Position anti-rattle spring.
3. Install pins - make sure pin collets are fully engaged
into caliper.
3. CAUTI O
NS:
The brake hose must only be installed with the vehicle's
body supported and the suspension hanging.
It is important that the brake hose is aligned correctly when