Anti-Lock Brake System (ABS) and Stability Control - Overview
Overview
The ABS and stability control systems are comprised of the following subsystems which assist the driver in maintaining control of the vehicle:
- ABS
- Drive away release (EPB)
- Electric parking brake control
- EBD
- ESC
- Launch control
- Selectable drive mode
- Supplemental braking assist
- Traction control
The ABS helps maintain steering control during hard braking by preventing wheel lock up. The ABS also includes a brake assist function which provides maximum brake system pressure during a severe braking situation.
The drive away release function automatically releases the electric parking brake once certain conditions have been met.
The ABS module is the ECU for the electric parking brake system. For information on the electric parking brake system, Refer to: Parking Brake - System Operation and Component Description .
The EBD system helps maintain vehicle control by keeping a balanced braking condition between the front and rear wheels.
The ESC system helps prevent skids or lateral slides by modulating brake fluid pressure to individual brake calipers and reducing engine torque.
The launch control feature works in conjunction with the ABS and the PCM to maximize traction from a standing start acceleration in a straight line. Launch control enables a unique "drag start" traction control calibration designed for high grip surfaces.
The selectable drive mode system helps maintain vehicle traction by adapting the responses of the engine, transmission, steering and stability control system to the demands of the current selected driving mode; normal, sport, wet, track and V-Max.
The supplemental braking assist system uses the hydraulic pump motor and HCU to provide additional braking to compensate for a loss of vacuum in the brake booster.
The traction control system helps prevent loss of traction by reducing drive-wheel spin during acceleration.
Some noise from the system and pulsations in the brake pedal are normal conditions during most ABS and stability control system activations. Longer than normal brake pedal travel may also be experienced immediately following an ABS or stability control system activation.