Jaguar XJ (X350). Manual — part 162

G189234t20 : CHECK FOR BRAKE SYSTEM LEAKS

1. Check for external brake system leaks. For additional information, refer to Brake master cylinder in

this section.

•

Are leaks found?

-> Yes

REPAIR as necessary, ADD fluid and BLEED brake system. For additional information, refer to General

Procedures. TEST the system for normal operation. REPEAT road test.

-> No

System is OK.

PINPOINT TEST G189234p6 : THE
PEDAL GOES DOWN SLOWLY

G189234t21 : ROAD TEST VEHICLE - CHECK BRAKE PEDAL OPERATION

1. Check if the condition occurs during actual stopping application by applying the brake pedal while

the vehicle is moving.

•

Does the condition occur when the vehicle is moving?

-> Yes

GO to Pinpoint Test

G189234t22

.

-> No

GO to Pinpoint Test

G189234t23

.

G189234t22 : CHECK FOR BRAKE SYSTEM LEAKS

1. Check for external brake system leaks. For additional information, refer to Brake master cylinder in

this section.

•

Are there any external brake system leaks?

-> Yes

REPAIR as necessary. ADD fluid and BLEED the brake system. For additional information, refer to

General Procedures. TEST the system for normal operation.

-> No

GO to Pinpoint Test

G189234t23

.

G189234t23 : CARRY OUT A BRAKE MASTER CYLINDER BYPASS TEST

1. Test for brake master cylinder bypass condition. Refer to Brake master cylinder component test in

this section.

•

Are any concerns found?

-> Yes

INSTALL a new brake master cylinder, ADD fluid and BLEED the brake system. For additional

information, refer to General Procedures. TEST the system for normal operation.

-> No

System is OK.

PINPOINT TEST G189234p7 :
EXCESSIVE BRAKE PEDAL EFFORT

G189234t24 : CHECK BRAKE PADS

1. Check the brake pads for wear, contamination, correct installation, damage and type.

•

Are any concerns found?

-> Yes

INSTALL the front brake pads correctly or INSTALL new front brake pads if necessary. For additional

information, refer to

<<206-03>>

. INSTALL the rear brake pads correctly or INSTALL new rear brake

pads if necessary. For additional information, refer to

<<206-04>>

. REPEAT road test.

-> No

GO to Pinpoint Test

G189234t25

.

G189234t25 : CHECK VACUUM

1. Disconnect the vacuum booster hose from the brake booster. 2. Connect a vacuum/pressure

tester to the vacuum hose. 3. Run the engine at normal operating temperature. 4. Record the

vacuum reading.

•

Is the reading 40.5kPa (12 in-Hg) or greater?

-> Yes

GO to Pinpoint Test

G189234t26

.

-> No

LOCATE and REPAIR the source of low vacuum. TEST the system for normal operation.

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G189234t26 : INSPECT SYSTEM

1. Switch the engine off. 2. Reconnect the vacuum hose. 3. Inspect the brake booster, rubber

grommet, and all vacuum plumbing for cracks, holes, damaged connections, or missing clamps. 4.

Pump the brake pedal several times to exhaust the vacuum. Push down on the brake pedal and hold.

•

Does the brake pedal move down when the engine is started?

-> Yes

Vacuum system is OK.

-> No

GO to Pinpoint Test

G189234t27

.

G189234t27 : CHECK POWER BRAKE BOOSTER VALVE

1. Check the brake booster valve. For additional information, refer to Brake Booster in this section.

•

Is the power brake booster valve OK?

-> Yes

CHECK the brake booster. For additional information, refer to Brake Booster in this section. INSTALL a

new brake booster if necessary. TEST the system for normal operation.

-> No

INSTALL a new brake booster valve. TEST the system for normal operation.

PINPOINT TEST G189234p8 : BRAKE
LOCKUP DURING LIGHT BRAKE
PEDAL FORCE

G189234t28 : TEST BRAKE LOCKUP

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

•

Do the brakes lockup?

-> Yes

GO to Pinpoint Test

G189234t29

.

-> No

Vehicle is OK.

G189234t29 : INSPECT BRAKE PADS

1. Inspect brake pads for contamination, correct installation, damage and type.

•

Are any concerns found?

-> Yes

CHECK the front brake pads. For additional information, refer to

<<206-03>>

. CHECK the rear brake

pads. For additional information, refer to

<<206-04>>

. INSTALL new brake pads as necessary. REPEAT

road test.

-> No

GO to Pinpoint Test

G189234t30

.

G189234t30 : INSPECT BRAKE CALIPERS

1. Inspect brake calipers for binding, leaking or sticking.

•

Are any concerns found?

-> Yes

CHECK the front brake calipers. For additional information, refer to

<<206-03>>

. CHECK the rear

brake calipers. For additional information, refer to

<<206-04>>

. INSTALL the brake calipers correctly

or INSTALL new brake calipers as necessary. TEST the system for normal operation. REPEAT road test

if necessary.

-> No

Vehicle is OK.

PINPOINT TEST G189234p9 : BRAKES
DRAG

G189234t31 : ROAD TEST VEHICLE

1. Road test the vehicle and apply the brakes.

•

Are the brakes functioning correctly?

-> Yes

Vehicle is OK.

-> No

GO to Pinpoint Test

G189234t32

.

G189234t32 : CHECK BRAKE CALIPERS

1. Check the front caliper pistons for binding, leaking or sticking. For additional information, refer to

<<206-03>>

. Check the rear caliper pistons for binding, leaking or sticking. For additional information,

refer to

<<206-04>>

.

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