Brakes and Traction Control: Description and Operation

Brake System

COMPONENT LOCATION









INTRODUCTION
Vehicle braking is achieved with a vacuum assisted, hydraulic circuit connected via an integrated ABS module and HCU, to the front and rear disc brake calipers. For increased safety, the hydraulic system is designed as a diagonally split dual circuit. This provides a primary and secondary braking circuit connected between the master cylinder and each front and opposing rear wheel.
The braking system provides anti-lock control to aid the driver, and to make sure the vehicle remains in control during all driving conditions and maneuvers. The sophisticated ABS functionality also integrates with other vehicle software controlled systems, to provide stability assistance and control when driving off-road.
The parking brake is a manually applied cable system that operates brake shoes, housed within the inner diameter of each rear brake disc.

FRONT AND REAR DISC BRAKES
The 3.2L i6 vehicle is installed with ventilated front and rear brake discs. The 2.2L TD4 vehicle is installed with ventilated front and solid rear brake discs. Both the i6 and TD4 vehicles feature single piston, sliding calipers on all brake discs. For additional information, refer to Front Disc Brake Front Disc Brake
For additional information, refer to Rear Disc Brake Rear Disc Brake

PARKING BRAKE
The parking brake is a manually applied, cable operated system. The RH and LH rear brake discs form the parking brake drums, and provide the location for the parking brake shoes and components. For additional information, refer to Parking Brake Description and Operation

HYDRAULIC BRAKE ACTUATION
Hydraulic brake actuation consists of the brake pedal, master cylinder, HCU, and the connecting hydraulic pipes and hoses.
The tandem brake master cylinder with reservoir is attached to, and operated by the brake booster. The brake master cylinder is a tandem design that supplies pressure to 2 independent (primary and secondary) hydraulic circuits. For additional information, refer to Hydraulic Brake Actuation Description and Operation

BRAKE BOOSTER
The brake booster is vacuum operated and provides power assistance to the brake hydraulic system. The booster is of tandem design that incorporates 2 separate diaphragms. On both the gasoline and diesel models, the vacuum required for booster operation is produced by an engine driven, vacuum pump. For additional information, refer to Brake Booster Description and Operation

ANTI-LOCK CONTROL
The anti-lock control system features a Continental Teves Mk25E1 ABS module with integral 4 channel HCU. The ABS module and HCU provide brake system monitoring, and active brake functions to control the vehicle stability and traction. The ABS module also provides specific functions to assist the vehicle during off-road driving.
The anti-lock control system provides the following functions:
- Anti-lock Brake System (ABS)
- Corner Brake Control (CBC)
- Dynamic Stability Control (DSC)
- Electronic Brake Force Distribution (EBD)
- Electronic Traction Control (ETC)
- Emergency Brake Assist (EBA)
- Engine Drag-Torque Control (EDC)
- Hill Descent Control (HDC) with gradient release control
- Roll Stability Control (RSC)
- Terrain Response system integration.
For additional information, refer to Anti-Lock Control - Stability Assist Anti-Lock Control - Stability Assist