front brake pad JAGUAR XFR 2010 1.G User Guide

Published: 11-May-2011
Front Disc Brake - TDV6 3.0L Diesel /V8 5.0L Petrol/V8 S/C 5.0L Petrol - Front Disc Brake - System Operation and Component Description
Description and Operation

Control Diagram

NOTE: A = Hardwired



Item Description 1 Battery 2 Megafuse (250 A) 3 Front brake pad wear sensor 4 Rear brake pad wear sensor 5 Instrument cluster 6 CJB (central junction box) 7 Power distribution box

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: 11-May-2011
Front Disc Brake - TDV6 3.0L Diesel /V8 5.0L Petrol/V8 S/C 5.0L Petrol - Brake Disc Vehicles With: High Performance Brakes
Removal and Installation

Removal


CAUTION: Brake discs must be renewed in pairs.


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. Refer to: Brake Pads - Vehicles With: High Performance Brakes (206-03B Front Disc Brake - TDV6 3.0L Diesel /V8 5.0L Petrol/V8 S/C 5.0L Petrol,
Removal and Installation).

3. Torque: 115 Nm 4.
Remove the 2 clips.
Clean the components mating faces.













Installation 5. Repeat the above procedure on the opposite side.

1. To install, reverse the removal procedure.

Published: 11-May-2011
Front Disc Brake - TDV6 3.0L Diesel /V8 5.0L Petrol/V8 S/C 5.0L Petrol - Brake Pads 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. Refer to: Wheel and Tire (204-04 Wheels and Tires, Removal and Installation).

3.

Published: 11-May-2011
Rear Disc Brake - TDV6 3.0L Diesel /V8 5.0L Petrol/V8 S/C 5.0L Petrol - Rear
Disc Brake - System Operation and Component Description
Description and Operation

Control Diagram

NOTE: A = Hardwired



Item Description 1 Battery 2 Megafuse (250 A) 3 Front brake pad wear sensor 4 Rear brake pad wear sensor 5 Instrument cluster 6 CJB (central junction box) 7Powerdistributionbox

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 rear wheel knuckle with two bolts. Each outboard brake pad
is installed with a wire anti-rattle spring.

The brake calipers on SC (supercharger) vehicles are painted and also include a logo badge, secured with two screws, which
must be removed in order to change the brake pads.
The inboard brake pad of the RH (right-hand) brake incorporates a wear sensor.

BRAKE PAD WEAR SENSORS

The brake pad wear sensor is wired in series with a wear sensor on the LH (left-hand) front 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.

Symptom Possible Causes Action

Wear in steering gear tie-rod end ball joints
Check and install new tie-rod
ends as required, refer to the
new module/component
installation note at the top of
the Symptom Charts
NOTE: Inner ball joint wear is rare. The steering
gear installed to all Jaguar vehicles has a spring
loaded pinion to ensure the correct level of
engagement between the rack and pinion. This play
is optimized with the steering gear in the central
position and should not be confused with inner ball
joint wear. Check for vertical motion in the inner ball
joint with the steering gear in the central position.
Wear in steering gear inner ball joints


Check and install new steering
gear as required, refer to the
new module/component
installation note at the top of
the Symptom Charts
Wear in suspension ball joints/bushings
Check and install new
components as required















Veer under braking




Steering gear not correctly adjusted
CAUTION: DO NOT attempt to
adjust the steering gear yoke. Failure to
follow this instruction will invalidate the
steering gear warranty

Check and install a new steering
gear as required, refer to the
new module/component
installation note at the top of
the Symptom Charts


Contamination of brake pads and discs
Check and rectify the source of
the contamination and install
new brake pads and discs as
required, refer to the new
module/component installation
note at the top of the Symptom
Charts




Seized front brake caliper slide pins or piston
Damaged brake discs
Check and rectify sticking slide
pins and install new calipers as
required, refer to the new
module/component installation
note at the top of the Symptom
Charts
Check and install new brake discs
as required, refer to the new
module/component installation
note at the top of the Symptom
Charts








Vehicle pulls to one side
when driving on a level
surface




Uneven tire wear
Incorrect tire pressure
For information on diagnosis of
uneven tire wear.
REFER to: Suspension System (204-00 Suspension System -
General Information, Diagnosis
and Testing).
Check and adjust tire pressures
as required.
REFER to: Specifications (204-04 Wheels and Tires,
Specifications).


Incorrect geometry settings
NOTE: Dealerships must keep a
copy of the BEFORE and AFTER
geometry figures with job card for future
reference

Check and adjust geometry as
required. REFER to: (204-00

13 Bypass valve 14 SC 15 Gasket 16 RH intake manifold 17 M08 x 30 mm crew (3 off) 18 M08 x 50 mm screw 19 N.H. pad 20 M6 x 15 mm screw (4 off) 21 M08 x 45 mm screw (4 off) 22 RH charge air cooler 23 M08 x 150 mm screw Supercharger

The SC is a Roots blower with high angle helix rotors driven at 2.1 x engine speed by the secondary belt of the accessory drive.
The two rotors of the SC are contained in a housing. The ends of the rotors are supported in bearings in the front cover and the bearing plate. A rear cover seals the bearing plate and incorporates a filler/level plug for lubricant. A pulley transfers power
from the accessory drive to the shaft of one of the rotors.

A pneumatic actuator on the front cover is attached to a by-pass valve in the housing. The bypass valve regulates a flow of air
from the outlet of the SC back to the inlet side of the rotors, to control the outlet pressure of the SC. Hoses connect the pneumatic actuator to the throttle T-piece of the air ducts, upstream of the electric throttle, and to the front cover, downstream
of the electric throttle. A lever connects the actuating rod of the pneumatic actuator to the shaft of the bypass
valve. A screw in the front cover limits movement of the lever in the closed direction to allow calibration of the SC output. The front cover also incorporates:

The SC air inlet and mounting face for the electric throttle. A connector stub for the part load breather.
A MAP (manifold absolute pressure) sensor.
A connector stub for a hose from the EVAP (evaporative emission) canister purge valve.
Intake Manifolds

Each intake manifold is attached to the SC with three screws and a bolt. Two dowels ensure correct alignment of each intake manifold. The RHD (right-hand drive) intake manifold incorporates a connection port for the noise feedback system. The LH intake manifold incorporates:
A connector stub for the brake vacuum system.
A MAPT (manifold absolute pressure and temperature) sensor.