2010 JAGUAR XFR warning

Does the brake pedal return to its original position? Yes
No action required, vehicle is OK.
No
GO to K2. K2: CHECK FOR BRAKE PEDAL BINDING 1 Disconnect the brake booster from the brake pedal. Check the brake pedal to ensure free operation. Is the brake pedal operating freely? Yes
Install a new brake booster as required. REFER to:
Brake Booster (206-07 Power Brake Actuation, Removal and Installation), Brake Booster - RHD (206-07, Removal and Installation).
Re-test the system for normal operation.
No
Repair or install new brake pedal. Re-test the system for normal operation. Component Tests

Brake Booster

1. Check all hoses and connections. All unused vacuum connectors should be capped. Hoses and their connections should
be correctly secured and in good condition with no holes and no collapsed areas. Inspect the valve on the brake booster
for damage.
2. Check the hydraulic brake system for leaks or low fluid.

3. With the automatic transmission in PARK, stop the engine and apply the parking brake. Pump the brake pedal several
times to exhaust all vacuum in the system. With the engine switched off and all vacuum in the system exhausted,
apply the brake pedal and hold it down. Start the engine. If the vacuum system is operating, the brake pedal will tend
to move downward under constant foot pressure. If no motion is felt, the vacuum booster system is not functioning.

4. Remove the vacuum hose from the brake booster. Manifold vacuum should be available at the brake booster end of the
hose with the engine at idle speed and the automatic transmission in PARK. Make sure that all unused vacuum outlets
are correctly capped, hose connectors are correctly secured and vacuum hoses are in good condition. When it is
established that manifold vacuum is available to the brake booster, connect the vacuum hose to the brake booster and
repeat Step 3. If no downward movement of the brake pedal is felt, install a new brake booster.

5. Operate the engine for a minimum of 10 seconds at a fast idle. Stop the engine and allow the vehicle to stand for 10
minutes. Then, apply the brake pedal with approximately 89 N (20lb) of force. The pedal feel (brake application) should
be the same as that noted with the engine running. If the brake pedal feels hard (no power assist), install a new valve
and then repeat the test. If the brake pedal still feels hard, install a new brake booster. If the brake pedal movement
feels spongy, bleed the brake system.
REFER to: Brake System Bleeding (206-00 Brake System - General Information, General Procedures). Brake Master Cylinder

Usually, the first and strongest indicator of anything wrong in the brake system is a feeling through the brake pedal. In
diagnosing the condition of the brake master cylinder, check pedal feel as evidence of a brake concern. Check for brake warning
lamp illumination and the brake fluid level in the brake master cylinder reservoir.
Normal Conditions
The following conditions are considered normal and are not indications that the brake master cylinder is in need of repair.

Modern brake systems are designed to produce a pedal effort that is not as hard as in the past. Complaints of light
pedal efforts should be compared to the pedal efforts of another vehicle of the same model and year.
The fluid level will fall with brake pad wear.

Abnormal Conditions

Changes in the brake pedal feel or brake pedal travel are indicators that something could be wrong in the brake system. The
diagnostic procedure and techniques use brake pedal feel, warning indicator illumination and low brake fluid level as indicators
to diagnosing brake system concerns. The following conditions are considered abnormal and indicate that the brake master
cylinder is in need of repair:

NOTE: Prior to carrying out any diagnosis, make sure the brake system warning indicator is functional.
Brake pedal goes down fast. This could be caused by an external or internal leak.
Brake pedal goes down slowly. This could be caused by an internal or external leak.
Brake pedal is low or feels spongy. This condition may be caused by no fluid in the brake master cylinder, reservoir cap
vent holes clogged or air in the hydraulic system.
Brake pedal effort is excessive. This may be caused by a bind or obstruction in the pedal/linkage, a faulty non-return
valve, booster or insufficient booster vacuum.
Rear brakes lock up during light pedal force. This may be caused by damaged brake pads, a partially applied parking
brake, a damaged ABS sensor or bearing failure.
Brake pedal effort erratic. This condition could be caused by the brake booster or incorrectly installed brake pads.
Brake warning indicator is on. This may be caused by low fluid level or float assembly damaged. www.JagDocs.com

Brake System - General Information - Brake System Bleeding
General Procedures
CAUTIONS:

The brake fluid reservoir must remain full with new, clean brake fluid at all times during bleeding. Published: 11-May-2011

Brake fluid will damage paint finished surfaces. If spilled, immediately remove the fluid and clean the area with water.


NOTE:

All vehicles

1. WARNING: Do not work on or under a vehicle supported only by a
jack. Always support the vehicle on safety stands.

Raise and support the vehicle.

2. Check that the brake fluid lines are secure and that there are no signs of
a brake fluid leak. If a brake fluid leak is detected, investigate and
rectify the cause of the leak before bleeding the brakes.

3. Remove the brake master cylinder cover.
Carefully release the clip.
















4. WARNING: Do not allow dirt or foreign liquids to enter
the reservoir. Use only new brake fluid of the correct
specification from airtight containers. Do not mix brands of
brake fluid as they may not be compatible.


CAUTION: Brake fluid will damage paint finished
surfaces. If spilled, immediately remove the fluid and clean
the area with water.
Remove the brake fluid reservoir cap.

Left-hand drive vehicles


11.
WARNING: Braking efficiency may be seriously
impaired if an incorrect bleed sequence is used.

Repeat the brake bleeding procedure for each brake
caliper, following the above sequence.










Right-hand drive vehicles




All vehicles

12.

WARNING: Braking efficiency may be seriously
impaired if an incorrect bleed sequence is used.

Repeat the brake bleeding procedure for each brake
caliper, following the above sequence.

13. Fill the brake fluid reservoir to the MAX mark.

14. Apply the brakes and check for leaks.

15. Install the brake fluid reservoir cap.

16. Install the brake master cylinder cover.
Carefully secure the clip.

Published: 17-Feb-2012
Brake System - General Information - Front Brake Disc Runout Check - With
Wheel On Vehicles With: High Performance Brakes
General Procedures

1. NOTES:


Some variation in the illustrations may occur, but the essential
information is always correct.


RH illustration shown, LH similar


All measurements must taken with the wheel installed.


2. WARNING: Make sure to support the vehicle with axle stands.

Raise the front of the vehicle.

3. Mount the DTI Dial Test Indicator (DTI) gauge to the bolt as shown with tool 100-053.

4. Make sure the DTI is securely mounted.

Published: 27-Feb-2012
Brake System - General Information - Rear Brake Disc Runout Check - With
Wheel On
General Procedures

1. NOTES:


Some variation in the illustrations may occur, but the essential
information is always correct.


RH illustration shown, LH similar.


All measurements must be taken with the wheel installed.


2. WARNING: Make sure to support the vehicle with axle stands.

Raise the rear of the vehicle.

3. Modify tool 100-053 with an M8 bolt and nut as shown.
4. Mount the DTI Dial Test Indicator (DTI) gauge on the tool as shown. www.JagDocs.com

BRAKE CALIPERS System Operation

When hydraulic pressure is supplied to the caliper, the pistons extend to force the inner pad against the brake disc. The caliper
reacts and slides along two guide pins to bring the outer pad into contact with the brake disc.

BRAKE PAD WEAR SENSORS

When a brake pad incorporating a brake pad wear sensor is approximately 75% worn, the sensor wire within the pad material
is worn through and the brake pad wear sensor goes open circuit. When the instrument cluster detects the open circuit, it
illuminates the amber LED (light emitting diode) in the brake warning indicator, displays an appropriate warning in the
message center and sounds a warning chime.
Refer to: Instrument Cluster (413-01 Instrument Cluster, Description and Operation).

NOTE: A new pad wear sensor lead must be fitted whenever the brake pads are changed, irrespective of the brake pad
warning sensor being triggered.



BRAKE CALIPERS Component Description

Each caliper is mounted within a fixed carrier that is secured to the front wheel knuckle with two bolts. The inboard brake pad
of the LH (left-hand) brake incorporates a wear sensor.

Each outboard brake pad is installed with a pressed steel anti-rattle spring. On SC (supercharger) vehicles, a badge with the
'R' symbol is formed on the anti-rattle spring.

BRAKE PAD WEAR SENSORS

The brake pad wear sensor is wired in series with a wear sensor on the RH (right-hand) rear brake and the instrument cluster.
If the thickness of one of the brake pads connected to a wear sensor decreases to a predetermined limit, the instrument
cluster illuminates the brake warning indicator.

Published: 02-May-2013
Front Disc Brake - TDV6 3.0L Diesel /V8 5.0L Petrol/V8 S/C 5.0L Petrol - Brake Caliper Vehicles With: High Performance Brakes
Removal and Installation

Removal


CAUTION: Brake fluid will damage paint finished surfaces. If spilled, immediately remove the fluid and clean the area
with water.


NOTE: Removal steps in this procedure may contain installation details.


1. WARNING: Do not work on or under a vehicle supported only by a jack.
Always support the vehicle on safety stands.
Raise and support the vehicle.

2. Remove the left-hand front wheel and tire.

Refer to: Wheel and Tire (204-04 Wheels and Tires, Removal and Installation).

3. www.JagDocs.com

7. CAUTION: Removal of the clips is a delicate
procedure, damage will occur if any force is used.


NOTE: Left-hand shown, right-hand similar.

Lever the anti-rattle spring in the center of the
spring until either side is released.

















8. WARNING: If the brake caliper piston seal is damaged
a new brake caliper must be installed.


CAUTION: Do not allow the brake caliper to hang on
the brake hose.


NOTE: Left-hand shown, right-hand similar.
















9. NOTE: Left-hand shown, right-hand similar.
Release the clip.