Jaguar X-Type Sedan and Estate (Wagon). Service manual — part 94
6. Disconnect the brake vacuum hose from the brake vacuum pump.
7. Remove the power steering hose support bracket.
8. Detach the cylinder head temperature (CHT) sensor electrical connector
away from the brake vacuum pump.
9. Using the special tool 303-397, disconnect the coolant hose.
10. Using the special tool 303-397, disconnect the coolant expansion tank
hose from the brake vacuum pump.
11. Using the special tool 303-397, disconnect the coolant hoses.
12. Remove the brake vacuum pump.
Remove and discard the gasket.
Installation
1.
CAUTION: Make sure the drive coupling is aligned with the
camshaft coupling.
• NOTE: Install a new brake vacuum pump gasket.
To install, reverse the removal procedure.
Tighten to 23 Nm.
Published: 11-May-2011
Anti-Lock Control - Stability Assist -
Lubricants, Fluids, Sealers and Adhesives
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• NOTE: Brake fluid ITT Super Dot 4 has now been superseded by Shell ESL Super Dot 4 which is the Jaguar recommended brake fluid.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
ITT Super Dot 4
Brake fluid
Shell ESL Super Dot 4
Torque Specifications
Description
Nm
lb-ft
lb-in
Brake line connections to brake pressure control valve block
17
13
-
Steering wheel sensor securing screws
1
-
9
Yaw rate sensor securing nut
6
-
53
Front wheel speed sensor securing screw
5
-
44
Rear wheel speed sensor securing screw - Vehicles with 2.5L and 3.0L engine
22
16
-
Rear wheel speed sensor securing screw - Vehicles with 2.0L or diesel engine
7
-
62
Published: 11-May-2011
Anti-Lock Control - Stability Assist - Anti-Lock Control - Stability Assist
Description and Operation
Item
Part Number
Description
1
—
Instrument cluster
2
-
Dynamic stability control 'ON/OFF' switch
3
-
ABS/Traction control hydraulic unit
4
-
Yaw rate sensor
5
-
Front wheel speed sensor
6
-
Steering wheel angle sensor
7
-
Rear wheel speed sensor - Vehicles with 2.5L and 3.0L engines
8
-
Rear wheel speed sensor - Vehicles with 2.0L or diesel engines
The anti-lock brake system (ABS) modulates brake pressure on each wheel independently to maintain vehicle stability during braking. The
ABS continually monitors the rotational velocity of each wheel anytime the ignition switch is in the RUN position and determines if a tire is
loosing traction when the brakes are applied. Only then does the ABS intervene to modulate the brake pressure to the necessary wheel. The
modulation continues until the wheel rotates freely. The brake pressure is then restored and the modulate/restore cycle is repeated
whenever loss of traction is detected. This cycle occurs at a rate of several times per second.
The ABS module is capable of detecting the following system conditions:
Hydraulic valve failure
Wheel speed sensor failure
ABS power relay short circuit
Interconnect failures to the ABS sensors, power and ground to the ABS module
Over/under voltage conditions
The ABS provides self-diagnostics and displays failure messages, via the ABS indicator, in the instrument cluster. Failure of the ABS module,
for whatever reason, will not compromise the normal operation of the brake system.
Dynamic stability control (DSC) maximizes vehicle stability under all conditions. The DSC system compares actual vehicle course to that
intended by the driver. If the intended course differs from the actual course due to over steer or under steer conditions, the DSC system will
brake individual wheels and reduce engine torque to bring the vehicle back to the driver's intended direction. By using a combined yaw rate
sensor and lateral accelerometer, the vehicles rotational motion around its vertical axis and centrifugal forces generated while cornering are
calculated to determine the vehicle's actual behavior. Using additional sensors for detecting steering wheel position and road wheel speed
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