1998 JAGUAR X308 wheel

Do t
he disc brake caliper pistons
and pins bind, leak or stick?
Yes INSTALL new calipers as necessary. TE ST the system for normal operation.
No GO to C4
.
C4: INSPECT BR
AKE DISCS
Check the brake discs fo

r excess
ive damage, thickness variatio n or runout. For additional
information, refer to General Procedures in this section.
1
D
oes excessive damage or runout exist?
Yes INSTALL new brake discs and brak e pads as necessary. TEST the system for normal operation.
No GO to C5
.
C5: INSPECT THE FRONT HU
B AND WHEEL BEARING ASSEMBLY
Check the fr

ont hub and wheel bearing assembly.
For additional information, refer toSection 204
-00

Su

spension System
- General
Information
. 1
Are th

e wheel bearings OK?
Yes GO to C6
.
No

INSTALL new wheel bearings. For additional inform ation, refer toSection 204
-01
Front Suspension
.
TEST the system
for normal operation.
C

6: CHECK SUSPENSION BUSHES AND BALL JOINTS.
Chec

k all suspension bu
shes and ball joints.
1
Are th
e suspension bushes and ball joints OK?
Yes Vehicle is OK.
No INSTALL new front suspension bushes and ball joints as required. For additional information, refer
toSection 204
-01
Front Suspension
. INSTALL n
ew rear suspension bush
es and ball joints as required.
For additional informat ion, refer toSection 204
-0
2 Rear Suspension
.
P

INPOINT TEST D : THE PEDAL FEELS SPONGY
TE
ST
CONDITIONS
D
ETAILS/RESULTS/ACTIONS
D

1: CHECK FOR SPONGY PEDAL (ENGINE OFF)
Check f

or a firm brake pedal.
1
Is th

e brake pedal effort an
d brake pedal travel normal?
Yes Vehicle is OK.
No GO to D2
.
D2:
CHECK BRAKE PEDAL RESERVE (ENGINE OFF)
Pump th

e brake pedal 10 times and
hold on the final application.
1
Does th
e brake pedal feel fi
rm on final application?
Yes GO to D3
.
No

BLEED the brake system. For additional information, re fer to General Procedures in this section. TEST
the system for normal operation.
D3:
CHECK BRAKE PEDAL RESERVE (ENGINE ON)
Engine is

idle.
1
Apply the brake pedal ligh

tl
y three or four times.
2
W
ait 15 seconds for the vacuum to recover.
3
Push down on

the brake pedal until it stops moving
downward or an increased resistance to the brake
pedal travel occurs.
4
Hol
d the brake pedal in the applied position while increasing the engine speed to 2000 revs/min.
5
Re

lease the accelerator pedal.
6
Does th

e brake pedal move downward as
the engine speed returns to idle?
Yes GO to D4
.
No

CHECK the vacuum to brake booster. For additional information, refer toSection 206
-0
7 Power Brake
Actuation.

Yes

Vehicle is OK.
No GO to J2
.
J
2: CHECK BRAKE FLUID LEVEL
Check the brake master cyli

nder reservoir fluid level.
1
Is the fl

uid level OK?
Yes GO to J3
.
No

CHECK brake master cylinder reservoir sealing points. For additional information, refer to Brake
Master Cylinder in this section. ADD brake fl uid and BLEED the brake system. For additional
information, refer to General Proc edures in this section. TEST the system for normal operation.
REPEAT road test if necessary.
J
3: CHECK BRAKE PEDAL RESERVE
Engine is

idle.
1
Apply the brake pedal ligh

tl
y three or four times.
2
W
ait 15 seconds for the vacuum to replenish.
3
Push down on

the brake pedal until it stops moving
downward or an increased resistance to the brake
pedal travel occurs.
4
Hol
d the brake pedal in the applied position while increasing the engine speed to 2000 revs/min.
5
Re

lease the accelerator pedal.
6
Does th

e brake pedal move downward as
the engine speed returns to idle?
Yes GO to J4
.
No

CHECK the vacuum to the brake booster. Fo r additional information, refer toSection 206
-0
7 Power
Brake Ac

tuation
.
J

4: CHECK THE FRONT HUB AND BEARING ASSEMBLY
Check the fr

ont hub and bearing assembly. Fo
r additional information, refer toSection 204
-01
Front
Suspe

nsion
. 1
Are th

e front wheel bearings loose?
Yes INSTALL a new front wheel bearin g if damaged. For additional information, refer toSection 204
-01

F

ront Suspension
. TEST
the system for normal operation.
No CHECK the front brake discs for thickness variances. For additional information, refer to General
Procedures in this section.
PINPO
INT TEST K : SLOW OR INCOMPLETE BRAKE PEDAL RETURN
TE
ST
CONDITIONS
D
ETAILS/RESULTS/ACTIONS
K1: C

HECK FOR BRAKE PEDAL RETURN
Ru

n the engine at fast idle while
making several brake applications.
1
Pull the
brake pedal rearward with approximately 44.5 N (10lb) force.
2
Relea

se the brake pedal and measure
the distance to the toe board.
3
Make a hard brake
application.
4
Relea

se the brake pedal and measure the brake
pedal to toe board distance. The brake pedal
should return to its original position.
5
Does th
e brake pedal return
to its original position?
Yes Vehicle is OK.
No GO to K2
.
K
2: CHECK FOR BRAKE PEDAL BINDING
Check the brake pedal to make
s
ure it is operating freely.
1
Is th

e brake pedal operating freely?
Yes INSTALL a new brake booster. For addi tional information, refer toSection 206
-0
7 Power Brake
Actuation. TEST

the system for normal operation.
No REPAIR or INSTALL new brake pedal. TE ST the system for normal operation.

Brake System - Gener
al Information - Front Brake Disc Runout
CheckVehicles With: Standard Brakes
Gen e
ral Procedures
S
p
ecial Tool(s)

Dial Test Indicator
G
auge and Stand.
1. Raise front of vehicle and support on stands. Refer to section
100-02.
2. Remove wheel.

3. CAUT
ION: Tie caliper housing aside. Do not allow the
caliper housing to hang on the hydraulic hose, as this will damage
the hose.
Remove caliper housing from caliper carrier.
1. Remove anti-rattle spring.
2. Remove dust covers.
3. Remove guide pins.
Remove an
d tie caliper housing aside.
4.
Make sure that wheel
bearing en
d-float is correct. Refer to
specification section 204-01.

5. Measure brake d
isc run-out.
Inst
al
l brake disc to hub and secure with all wheel nuts,
tighten wheel nuts to 20 Nm in a diagonal sequence.
Posi
tion the gauge so that the pointer contacts the disc,
10 mm from its outer edge.
Slo w
ly rotate the disc one revolution, the disc run-out
must not exceed the specification. Refer to Specification
Section 206-03.
6. If the brake disc run-out exceeds specification, reposition the
brake disc on the hub and re peat the above procedure.
Continue repositioning the brake di sc until the run-out is within
specification.
7. If the brake disc run-out still exceeds specification, check the
hub face run-out.
8. Remove brake disc. Refer to procedure 70.10.12.
9. Measure hub face run-out.
Posi
tion the gauge so that the pointer contacts the hub
face.
Slo w
ly rotate the hub one revolution, the hub run-out

mu
st not exceed the specification. Refer to Specification
Section 204-01.
I
f the hub exceeds the maximum run-out specification
replace the hub. Refer to procedure 60.25.01.
10. NOTE: Make sure the brake disc and hub mating surfaces are
clean.
If the hub run-out is within sp ecification replace brake discs.
Refer to procedure 70.10.12.

11
.
Install caliper housing to caliper carrier.
Align hou
sing to carrier.
1. Install and tighten guide pins to 25-30 Nm.
2. Install dust covers.
3. Install anti-rattle spring.
12. Install wheel. Refer to procedure 74.20.05.

Fr
ont Brake Disc Runout Check Vehicles With: Brembo Brakes
Special Service tools
Di
al Test Indicator Gauge and Stand.
1.


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.
CA
UTION:
Replacement of nuts and bolts: Various thread-locking devices 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.
CA
UTION:
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 bracket to the vertical link only. DO NOT loosen any other caliper bolts.
Raise front of vehicle and support on stands. Refer to section <<100-02>>.
2. Remove wheel. Refer to section <<74.20.05>>.

R
emove and tie caliper aside.
5. Make sure that wheel bearing end-float is within specification. Refer to specification section <<204-01>>.
6.
Measure brake disc run-out.
1. Install brake disc to hub and secure with all wheel nuts, tighten wheel nuts to 20 Nm in a diagonal sequence.
2. Position the gauge so that the pointer contacts the disc, between the disc's outer drill holes and the disc's outer edge.
 Slowly rotate the disc one revolution, the disc run-out must not exceed the specification. Refer to
Specification Section <<206-03>>.
7. If the brake disc run-out exceeds specification, reposition the brake disc on the hub and repeat the above
procedure. Continue repositioning the brake disc until the run-out is within specification.
8. If the brake disc run-out still exceeds specification, check the hub face run-out.
9. Remove brake disc.

14
.
CA
UTION:
Retracting the caliper piston may cause the fluid reservoir to over-flow. Remove brake fluid
spillage immediately from paint work, with clean water.
CA
UTION:
Note the condition of pins and 'R' clips and replace if necessary.
Install brake pads into caliper housing. Slowly retract caliper pistons.
1. Install pads.
2. Position anti-rattle spring.
3. Install pins.
4. Install 'R' clips.
15. Install wheels. Refer to operation <<74.20.05>>.

R
ear Brake Disc Runout Check Vehicles Without: Brembo Brakes
Special Service tools
D
ial Test Indicator Gauge and Stand.
1

. Raise rear of vehicle and support on stands. Refer to section
<<100-02>>.
2. Remove wheel.
3
.
C
AUTION:
Tie caliper housing aside. Do not allow the caliper housing to hang on the hydraulic hose, as this
will damage the hose.
Remove caliper housing from caliper carrier. 1. Remove anti-rattle spring.
2. Remove dust covers.
3. Remove guide pins.
4. Remove housing from carrier.
 Tie caliper housing aside.
4. NOTE: