Jaguar XJ (X350). Manual — part 158

The parking brake module is located in the luggage compartment behind the right-hand rear
luggage compartment trim panel and operates the rear brakes through a motor and cable
system.

Brake System - VIN Range: G45704-
>G99999

WARNING: Brake fluid contains polyglycol ethers and polyglycols. Avoid contact

with the eyes. Wash hands thoroughly after handling, as prolonged contact may cause
irritation and dermatitis. If brake fluid contacts the eyes, flush the eyes with cold water
or eyewash solution and seek medical attention. If taken internally do not induce
vomiting, seek immediate medical attention. Failure to follow these instructions may
result in personal injury.

The braking system is a diagonally split, dual circuit design featuring front and rear disc
brakes.

The hydraulic system provides separate circuits for each pair of diagonally opposed wheels
(left front, right rear and right front, left rear).

The standard front brake caliper has two retaining bolts that attach the brake caliper to the
anchor plate. These are of single, sliding piston type. The anchor plate is attached to the wheel
knuckle with two bolts. The standard brake disc is manufactured from cast iron and is of the
vented type. It is retained on the hub by two retaining clips and the wheel studs.

The high performance front brake caliper has two retaining bolts that attach the brake caliper
to the anchor plate. These are of single, sliding piston type. The anchor plate is attached to the
wheel knuckle with two bolts. The high performance brake disc is manufactured from cast
iron and is of the vented type. It is retained on the hub by two retaining clips and the wheel
studs.

The rear brake calipers are single pistoned floating caliper type, which also incorporates the
park brake mechanism. In addition, the high performance caliper has a logo badge which has
to be removed when changing the brake pads. The brake disc is manufactured from cast iron
and is of the vented type. It is retained on the hub by two retaining clips and the wheel studs.

The brake pads in all cases are asbestos free.

Braided steel brake hoses are fitted to reduce expansion under braking pressure and are of a
light weight design.

The brake master cylinder is of a tandem design and is linked to a brake booster to reduce the
brake pedal effort. The tandem design will make sure that in the event of one brake circuit
failure the other will remain fully operational. The brake booster operating rod is connected
directly to the brake pedal.

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The parking brake module is located in the luggage compartment behind the right-hand rear
luggage compartment trim panel and operates the rear brakes through a motor and cable
system.

Diagnosis and testing

Brake System

Principles of Operations

The brake system operates by transferring effort applied to the brake pedal, by the driver to the

brakes at each wheel.

The braking effort is distributed to each wheel, using a hydraulic system. The system is assisted using

a vacuum brake booster that reduces pedal effort for a given hydraulic pressure. The parking brake

operates on the rear wheels and is applied using a pull/push switch mounted on the floor console.

The adjustable pedal system allows adjustment of the throttle, brake and clutch pedals by a switch

fitted on the steering column shroud.

Inspection and Verification

NOTE:

Prior to carrying out any diagnosis, make sure that the brake system warning indicator is

functional.

Visually examine the front and rear wheel and tire assemblies for damage such as uneven wear

patterns, tread worn out or sidewall damage. Verify the tires are the same size, type and, where

possible, same manufacture. Replace the damaged wheel or excessively worn tire. For additional

information, refer to

<<204-04>>

.

Wheels and tires must be cleared of any foreign matter and tire pressures adjusted to the correct

specification.

If the tires exhibit uneven wear or feathering, the cause must be corrected. Check the steering and

suspension components for damage or wear and, if necessary, check and adjust front wheel

alignment. For additional information, refer to

<<204-00>>

.

Road Test

Visual Inspection Chart

Mechanical

Electrical

Brake master cylinder

Parking brake actuator

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