Electrical JAGUAR XFR 2010 1.G Workshop Manual

Brake System - General Information - Brake System
Diagnosis and Testing

Principle of Operation Published: 11-May-2011

For a detailed description of the brake system, refer to the relevant Description and Operation sections in the workshop
manual. REFER to:

Front Disc Brake (206-03, Description and Operation),
Front Disc Brake (206-03, Description and Operation),
Front Disc Brake (206-03, Description and Operation),
Rear Disc Brake (206-04, Description and Operation),
Rear Disc Brake (206-04, Description and Operation),
Rear Disc Brake (206-04, Description and Operation),
Parking Brake (206-05 Parking Brake and Actuation, Description and Operation), Parking Brake (206-05 Parking Brake and Actuation, Description and Operation), Parking Brake (206-05 Parking Brake and Actuation, Description and Operation), Hydraulic Brake Actuation (206-06 Hydraulic Brake Actuation, Description and Operation), Hydraulic Brake Actuation (206-06 Hydraulic Brake Actuation, Description and Operation), Hydraulic Brake Actuation (206-06 Hydraulic Brake Actuation, Description and Operation), Brake Booster (206-07 Power Brake Actuation, Description and Operation), Brake Booster (206-07 Power Brake Actuation, Description and Operation), Brake Booster (206-07, Description and Operation).

Inspection and Verification

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 manufacturer. Replace the damaged
wheel or excessively worn tire.
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. REFER to: (204-00 Suspension System - General
Information)
Specifications (Specifications), Front Toe Adjustment (General Procedures).
Visual Inspection
Mechanical Electrical
Brake master cylinder
Brake caliper piston(s)
Brake discs
Wheel bearings
Brake pads
Power brake booster
Brake pedal linkage
Brake booster vacuum hose
Tires
Debris
Parking brake actuator
Parking brake module
Parking brake switch
Damaged or corroded wiring harness
Brake master cylinder fluid level switch Road Test

Carry out a road test to compare actual vehicle braking performance with the performance standards expected by the driver.
The ability of the test driver to make valid comparisons and detect performance deficiencies will depend on experience.

The driver should have a thorough knowledge of brake system operation and accepted general performance guidelines to make
good comparisons and detect performance concerns.

An experienced brake technician will always establish a route that will be used for all brake diagnosis road tests. The roads
selected will be reasonably smooth and level. Gravel or bumpy roads are not suitable because the surface does not allow the
tires to grip the road equally. Crowned roads should be avoided because of the large amount of weight shifted to the low set
of wheels on this type of road. Once the route is established and consistently used, the road surface variable can be
eliminated from the test results.

Before a road test, obtain a complete description of the customer concerns or suspected condition. From the description, the
technician's experience will allow the technician to match possible causes with symptoms. Certain components will be tagged
as possible suspects while others will be eliminated by the evidence. More importantly, the customer description can reveal
unsafe conditions which should be checked or corrected before the road test. The description will also help form the basic
approach to the road test by narrowing the concern to specific components, vehicle speed or conditions.

Begin the road test with a general brake performance check. Keeping the description of the concern in mind, test the brakes at
different vehicle speeds using both light and heavy pedal pressure. To determine if the concern is in the front or rear braking
system, use the brake pedal and then use the parking brake control. If the condition (pull, vibration, pulsation) occurs only
with the parking brake, the concern is in the rear brake system.

Symptom Possible Cause Action Electrical circuit
For parking brake control and circuit tests.
REFER to: Parking Brake (206-05, Diagnosis and Testing). Slow or incomplete brake
pedal return
Brake pedal binding
Brake booster/master cylinder GO to Pinpoint Test K. Pinpoint Tests

PINPOINT TEST A : BRAKES NOISY TEST
CONDITIONS DETAILS/RESULTS/ACTIONS A1: 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 A2. No
Clean/install new front and rear brake pads as required. REFER to:
Brake Pads - Vehicles With: Standard Brakes (206-03A Front Disc Brake - V6 3.0L Petrol, Removal and Installation),
Brake Pads - Vehicles With: High Performance Brakes (206-03A Front Disc Brake - V6 3.0L Petrol, Removal and Installation),
Brake Pads (206-04A Rear Disc Brake - V6 3.0L Petrol, Removal and Installation), Brake Pads - Vehicles With: High Performance Brakes (206-04, Removal and Installation).
Re-test vehicle for brake noise. A2: 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 and rear brake discs and brake pads as required. REFER to:
Brake Pads - Vehicles With: Standard Brakes (206-03A Front Disc Brake - V6 3.0L Petrol, Removal and Installation),
Brake Pads - Vehicles With: High Performance Brakes (206-03A Front Disc Brake - V6 3.0L Petrol, Removal and Installation),
Brake Pads (206-04A Rear Disc Brake - V6 3.0L Petrol, Removal and Installation), Brake Pads - Vehicles With: High Performance Brakes (206-04, Removal and Installation),
Brake Disc - Vehicles With: Standard Brakes (206-03A Front Disc Brake - V6 3.0L Petrol, Removal and Installation),
Brake Disc - Vehicles With: High Performance Brakes (206-03A Front Disc Brake - V6 3.0L Petrol, Removal and Installation),
Brake Disc (206-04A Rear Disc Brake - V6 3.0L Petrol, Removal and Installation), Brake Disc - Vehicles With: High Performance Brakes (206-04, Removal and Installation).
Re-test vehicle for brake noise.
No
No action required, vehicle is OK.
PINPOINT TEST B : VIBRATION WHEN BRAKES ARE APPLIED TEST
CONDITIONS DETAILS/RESULTS/ACTIONS B1: ROAD TEST VEHICLE 1 Road test the vehicle between 40-80 km/h (25-50 mph) without applying brakes. Is the vibration present?
Yes
For noise vibration and harshness tests.
REFER to: Noise, Vibration and Harshness (NVH) (100-04 Noise, Vibration and Harshness, Diagnosis and Testing).
No
GO to B2. B2: 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 to specification as required. Check
the balance of all road wheels and tires and repair as required. Check the brake discs for excessive wear,
runout, thickness variation or cracks. Install new brake discs and brake pads as required. GO to B3. No
No action required, vehicle is OK. B3: 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.

7 Instrument cluster 8 Parking brake switch 9 Parking brake actuator


Static Apply System Operation

The EPB module receives a vehicle speed signal from the ABS (anti-lock brake system) module on the high speed CAN bus. If the parking brake switch is pulled to the 'Apply' position and vehicle speed is less than 2 mph (3 km/h), the EPB module will
instigate its 'Static Apply' mode and drive the actuator to apply full parking brake force to the rear wheels.

The EPB module monitors the current drawn by the actuator and compares this to information held within its configuration
software to determine when full braking force has been applied.

Dynamic Apply

There are two 'Dynamic Apply' modes; low speed dynamic and high speed dynamic. The low speed dynamic mode operates at
speeds between 2 mph (3 km/h) and 20 mph (32 km/h). The high speed dynamic mode operates at speeds above 20 mph (32
km/h).

If the parking brake switch is pulled up to the 'Apply' position and vehicle speed is within the low speed dynamic range, the
EPB module drives the actuator to apply full parking brake force to the rear wheels.

If the parking brake switch is pulled up to the 'Apply' position and vehicle speed is within the high speed dynamic range, the
EPB module will apply braking force to the rear wheels at a slower rate until full braking load is reached or the switch is
released. The rate with which braking force is applied is controlled by the EPB module, which monitors both current drawn by
the actuator and positional information from the actuator hall sensor and compares this to information held within its
configuration software.

Drive Away Release

The EPB module will initiate its 'Drive Away Release' function and automatically release the parking brake if the following
conditions are detected:
The engine is running.
Drive , or reverse is selected.
Positive throttle movement is detected.

The EPB module receives messages of gear selector position and throttle angle over the high speed CAN bus from the TCM (transmission control module) and the ECM (engine control module) respectively.

Release from Park

The EPB module will initiate its 'Release from Park' function and automatically release the parking brake if the gear selector is
moved from Park to any position except Neutral.

Repairs

Before carrying out any work on the parking brake system, the Jaguar approved diagnostic system must be connected and the
'parking brake unjam' routine run. The routine can be found in the 'Vehicle Configuration' area, under the 'Set-up and
Configuration' menu. After any work has been carried out on the parking brake, the system will require resetting.


CAUTION: Do not use the 'Emergency Release' tool to allow work to be carried out on the parking brake. Work can only be
carried out on the parking brake system after the 'parking brake unjam' routine has been run.

Resetting

If the electrical supply is disconnected from the EPB module, the actuator will loose its position memory. On battery
re-connection and ignition on, 'APPLY FOOT AND PARK BRAKE' will be displayed in the instrument cluster message center
indicating the parking brake requires resetting.
Refer to: Parking Brake (206-05, Diagnosis and Testing).

Operating Voltages

The EPB module will only operate the actuator if the power supply from the battery is between 9 V and 16 V. At any voltage
within this range, the actuator is able to fully tighten and release the brake cables. If the power supply falls outside of the
range, a fault code is stored in the EPB module and can be retrieved using the Jaguar approved diagnostic system.

Stoplamp Switch



The stoplamp switch is mounted on the brake pedal box. One of the prerequisites for releasing the parking brake is that the
foot brake is applied. The EPB module is able to determine the position of the footbrake by monitoring the status of the
stoplamp switch via a hardwired electrical connection.
The stoplamp switch also forms part of:
The ABS. Refer to: Anti-Lock Control - Stability Assist (206-09 Anti-Lock Control - Stability Assist, Description and Operation). The speed control system. For additional information, refer to:
Speed Control (310-03A, Description and Operation),
Speed Control (310-03B, Description and Operation),
Speed Control (310-03C, Description and Operation).

Red Illuminated Parking brake applied Red Flashing Parking brake electrical failure Amber Illuminated Parking brake electrical failure If a parking brake failure warning indicator is active, the message 'CANNOT APPLY PARK BRAKE' or 'PARK BRAKE FAULT' will
also appear in the instrument cluster message center. If the vehicle is moving with the parking brake applied, the message
'PARK BRAKE ON' will appear in the message center accompanied by a chime from the instrument cluster.
Refer to: Information and Message Center (413-08 Information and Message Center, Description and Operation).

Parking Brake and Actuation - Parking Brake
Diagnosis and Testing

Principle of Operation Published: 12-May-2014

For a detailed description of the Parking Brake operation, refer to the relevant Description and Operation section of the
workshop manual. REFER to: (206-05 Parking Brake and Actuation)

Parking Brake (Description and Operation), Parking Brake (Description and Operation), Parking Brake (Description and Operation).
Parking Brake Calibration

The parking brake system must be calibrated whenever the battery has been disconnected or has been in a state of discharge,
or repairs have been carried out to the rear service or parking brake system.


NOTE: If new rear brake pads have been installed, pressure must be applied to the brake pedal a minimum of five times
prior to calibration of the parking brake system.
To calibrate the parking brake system:
1. Place gear selector lever in 'P' Park position.

2. Release parking brake cable tension to service position.
REFER to: Parking Brake Cable Tension Release (206-05 Parking Brake and Actuation, General Procedures).
3. Set the ignition status to 'ON'.
4. Apply and hold the footbrake then pull up the parking brake switch.

5. To release the parking brake, apply and hold the footbrake then release and press down the parking brake switch.

Inspection and Verification


CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not
guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor vehicle.
1. Verify the customer concern.
2. Visually inspect for obvious signs of damage and system integrity.

Visual Inspection
Mechanical Electrical
Parking brake cable
Parking brake actuator
Brake caliper
Brake pads
Stabilizer bar drop link caps
Fuse(s)
Wiring harness/electrical connectors
Check for bent/corroded pins
Parking brake switch
Parking brake module
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to
the next step.

4. If the cause is not visually evident check the system for any logged Diagnostic Trouble Codes (DTCs) and proceed to
the DTC Index , alternatively, verify the customer concern and refer to the Symptom Chart.
Symptom Chart

Symptom Possible Cause Action The parking brake will not
engage or release (with no
parking brake warning
message)
Cables fouled, trapped or damaged
Cables incorrectly routed or installed
Rear lining wear
Service brake incorrectly adjusted following
lining change
Caliper malfunction
Check the rear and primary
cables for correct installation
and damage
Inspect the rear brake linings for
wear
Re-calibrate the parking brake,
refer to the calibration procedure
Check the rear service brake for
correct installation and operation

3. WARNING: Failure to follow this instruction may result in a
diagnostic trouble code (DTC) being generated.

Disconnect the 2 electrical connectors from the parking
brake module, in the sequence illustrated.




















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

Connect the special tool to the parking brake module.










5. Release the parking brake cable tension.
An audible 'click', signals complete parking brake cable
tension release.











6. Remove the special tool and carry out any necessary repairs on the
system.

7. Connect the electrical connectors in the sequence shown.




















8. Install the RH loadspace trim panel.
For additional information, refer to: Loadspace Trim Panel RH (501-05 Interior Trim and Ornamentation, Removal and Installation).


9. WARNING: Calibrate the electric park brake using Jaguar approved
diagnostic equipment. If Jaguar approved diagnostic equipment is not
available disconnect the battery for approximatly 30 seconds , the
vehicle will then prompt the driver to carry out the calibration procedure
as per the vehicle hand book on re-connection.
Calibrate the electric park brake.

1 Brake fluid level switch electrical connector 2 Brake fluid reservoir cap 3 Brake fluid reservoir 4 Primary circuit inlet port 5 Brake master cylinder 6 Torx bolt 7 Primary circuit outlet 8 Secondary circuit outlet 9 Secondary circuit inlet port 10 Reservoir to master cylinder seal (2 off) The brake booster and master cylinder assembly is fitted in the engine compartment. The brake master cylinder housing
consists of two hydraulic chambers containing two pistons in tandem. The primary piston (adjacent to the brake booster)
produces pressure for the primary braking circuit and this pressure acts on the secondary piston and hence creates pressure in
the secondary circuit. A brake fluid reservoir is mounted on top of the master cylinder to provide a supply of brake fluid to the
brake system. The reservoir cap is fitted with a brake fluid level switch. Brake Master Cylinder and Fluid Reservoir

Hydraulic Brake Actuation - Brake Fluid Reservoir
Removal and Installation

Removal Published: 11-May-2011

CAUTION: If brake fluid is spilt on the paintwork, the affected area must be immediately washed down with cold water.

1. Remove the brake fluid reservoir cap.
2. Disconnect the brake fluid level electrical connector.
3. Using a suitable suction device drain the brake fluid resrvoir.