Anti-Lock Control - Stability Assist: Introduction

WARNING: This page is about a different car, the 2011 Jaguar XKR, 2011 Jaguar XK, 2010 Jaguar XKR, and 2010 Jaguar XK. However, it is still accessible from the selected car via links, so may be relevant.

The anti-lock brake system (ABS) and DSC (dynamic stability control) system features a Bosch modulator, which is an integrated four-channel hydraulic control unit (HCU) and anti-lock brake system (ABS) module. The unit is installed in the brake hydraulic circuit between the brake master cylinder and the four brake calipers.

The anti-lock brake system (ABS) module is connected to the high speed controller area network (CAN) bus, and actively interacts with other vehicle system control modules and associated sensors to receive and transmit current vehicle operating information.

When required, the anti-lock brake system (ABS) module will actively intervene and operate the hydraulic control unit (HCU) during braking or vehicle maneuvers to correct the vehicle attitude, stability, traction or speed. During incidents of vehicle correction, the anti-lock brake system (ABS) module may also request the engine control module (ECM) to control engine power in order to further stabilize and correct the vehicle.

To provide full system functionality, the anti-lock brake system (ABS) and DSC system comprise the following components:

DSC switch.
Four wheel speed sensors.
Steering angle sensor.
Yaw rate and lateral acceleration sensor.
Stoplamp switch.
Instrument cluster indicator lamps.
Integrated anti-lock brake system (ABS) module and hydraulic control unit (HCU).

Two variants of anti-lock brake system (ABS) module are available, Bosch ESP®8.1 and Bosch ESP®plus8.1. The Bosch ESP®plus8.1 system is fitted to vehicles with ASC (adaptive speed control) and incorporates a feature known as 'electronic brake prefill'.

The anti-lock brake system (ABS) provides the following brake functions that are designed to assist the vehicle or aid the driver:

anti-lock brake system (ABS).
DSC, including TracDSC.
CBC (corner brake control).
electronic brake force distribution (EBD).
ETC (electronic traction control).
emergency brake assist (EBA).
EDC (engine drag-torque control).
Understeer control.
Electronic brake prefill (vehicles with ASC only).

All the brake functions listed are automatically active when the ignition is in power mode and the engine is running. The DSC system can be selected to off using the DSC switch.

WARNING: Although the vehicle is fitted with DSC, it remains the drivers responsibility to drive safely according to the prevailing conditions.