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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.
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Brake hose to brake caliper 42 31 - Brake caliper anchor plate 103 76 - Brake caliper retaining bolts 28 21 - Brake caliper logo badge retaining bolts - Vehicles with high performance brakes 10 7 -
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1 Retaining washer (2 off) 2 Brake disc 3 Rivet (3 off) 4 Brake dust shield 5 Rear wheel knuckle/hub and bearing assembly 6 Caliper carrier bolt (2 off) 7 Brake pad wear sensor 8 Guide pin dust cover (2 off) 9 Guide pin bush (2 off) 10 Guide pin (2 off) 11 Caliper carrier 12 Brake caliper housing 13 Piston 14 Piston dust cover 15 Inboard brake pad and shim 16 Outboard brake pad 17 Anti-rattle spring 18 Bleed screw 19 Bleed screw dust cap 20 Knurled pin 21 Parking brake lever 22 Parking brake return spring
Page 632 of 3039
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.
Page 638 of 3039
Published: 11-May-2011
Rear 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
Special Tool(s)
206-080
Brake caliper piston retractor tool
206-081
Brake caliper piston retractor tool
303-588
Remover, Crankshaft Pulley/Damper Removal
WARNINGS:
Failure to release the tension and calibrate the electric parking brake during rear parking brake related service procedures,
could cause the parking brake to function incorrectly or become inoperative.
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.
Brake pads must be renewed in axle sets only, otherwise braking efficiency may be impaired.
CAUTION: Brake fluid will damage paint finished surfaces. If spilled, immediately remove the fluid and clean the area
with water.
NOTES:
Only extraction bolt from special tool 303-588 is used.
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.
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Parking brake module retaining bolts 4 - 35 Parking brake release actuator retaining bolts 20 15 -
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Hydraulic Brake Actuation -
Lubricants, Fluids, Sealers and Adhesives Published: 11-May-2011
CAUTION: Do not use brake fluid ITT Super Dot 4 on 2006my vehicles onwards. Failure to follow this instruction may
result in damage to the vehicle.
NOTE: Brake fluid ITT Super Dot 4 has now been superseded by Shell ESL Super Dot 4 which is the Jaguar recommended
brake fluid. Shell ESL Super Dot 4 can be used on all model years.
Item Specification Brake fluid Shell ESL Dot 4 Torque Specifications
Description Nm lb-ft lb-in Brake master cylinder to brake booster retaining nuts. 25 18 - HCU to brake master cylinder brake tubes 17 13 - Brake master cylinder reservoir retaining bolts 4 - 35
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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
