Jaguar XJ (X350). Manual — part 160

•

Brake calipers.

Action(s) to take:

•

GO to Pinpoint Test H.

Brakes drag

Possible Source(s):

•

Parking brake control applied/malfunction.

•

Seized parking brake cables.

•

Seized caliper slide pins.

•

Seized brake caliper.

•

Brake booster.

•

Pedal gear.

Action(s) to take:

•

GO to Pinpoint Test I.

Excessive/Erratic brake pedal travel

Possible Source(s):

•

Hydraulic system.

•

Brake pads.

•

Brake discs.

•

Hub and bearing assembly.

Action(s) to take:

•

GO to Pinpoint Test J.

The red brake warning indicator is always on

Possible Source(s):

•

Fluid level.

Action(s) to take:

•

FILL the system to specification. CHECK for leaks.

Possible Source(s):

•

Brake fluid level sensor.

Action(s) to take:

•

INSTALL a new brake master cylinder fluid reservoir. For additional information, refer to

<<206-06>>

.

Possible Source(s):

•

Parking brake control.

Action(s) to take:

•

For additional information,

<<206-05>>

Possible Source(s):

•

Electrical circuit.

Action(s) to take:

•

For additional information,

<<206-05>>

Slow or incomplete brake pedal return

Possible Source(s):

•

Brake pedal binding.

•

Brake booster/master cylinder.

Action(s) to take:

•

GO to Pinpoint Test K.

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PINPOINT TEST G189234p1 : BRAKES
NOISY

G189234t1 : INSPECT BRAKE PADS

1. Inspect the condition of the front and rear brake pads. Check for damage to any anti-squeal shims.

•

Are the brake pads OK?

-> Yes

GO to Pinpoint Test

G189234t2

.

-> No

CLEAN the front brake pads or INSTALL new front brake pads if necessary. For additional information,

refer to

<<206-03>>

. CLEAN the rear brake pads or INSTALL new rear brake pads if necessary. For

additional information, refer to

<<206-04>>

. Test vehicle for presence of brake squeal.

G189234t2 : INSPECT BRAKE DISCS

1. Inspect the brake discs for excessive corrosion, wear or disc thickness variation.

•

Does excessive corrosion, wear or disc thickness variation exist?

-> Yes

INSTALL new front brake discs and brake pads. For additional information, refer to

<<206-03>>

.

INSTALL new rear brake discs and brake pads. For additional information, refer to

<<206-04>>

. TEST

the system for normal operation.

-> No

Vehicle is OK.

PINPOINT TEST G189234p2 :
VIBRATION WHEN BRAKES ARE
APPLIED

G189234t3 : ROAD TEST VEHICLE

1. Road test the vehicle between 40-80 km/h (25-50 mph) without applying brakes.

•

Is the vibration present?

-> Yes

TEST for noise vibration and harshness. For additional information, refer to

<<100-04>>

. REPEAT road

test if necessary.

-> No

GO to Pinpoint Test

G189234t4

.

G189234t4 : CHECK FOR BRAKE VIBRATION

1. Road test the vehicle between 40-80 km/h (25-50 mph) with light and medium application on the

brake pedal.

•

Is a vibration present?

-> Yes

CHECK the brake caliper mounting bolts and wheel hub nuts and TIGHTEN as necessary. CHECK the

balance of all road wheels and REPAIR as necessary. CHECK the brake discs for excessive wear,

runout, thickness variation or cracks.

INSTALL new brake discs and brake pads as necessary. GO to Pinpoint Test

G189234t5

.

-> No

Vehicle is OK.

G189234t5 : IS VIBRATION STILL PRESENT UNDER BRAKE APPLICATION?

1. Road test the vehicle between 40-80 km/h (25-50 mph) with light and medium application on the

brake pedal.

•

Is a vibration present?

-> Yes

CHECK for wear or failure of steering bushes. For additional information, refer to

<<211-02>>

. CHECK

for wear or failure of steering ball joints. For additional information, refer to

<<211-03>>

. CHECK for

wear or failure of front wheel bearings, suspension bushes and ball joints. For additional information,

refer to

<<204-01>>

. CHECK for wear or failure of rear wheel bearings, suspension bushes and ball

joints. For additional information, refer to

<<204-02>>

.

-> No

Vehicle is OK.

PINPOINT TEST G189234p3 : THE
BRAKES PULL OR DRIFT

G189234t6 : ROAD TEST VEHICLE

1. Road test the vehicle and apply the brake pedal.

•

Does the vehicle pull or drift?

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