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
- Curve control
- EBB
- Drive away release (EPB)
- EBD
- EPB control
- ESC
- Hill start assist
- RSC
- Selectable drive modes
- Supports adaptive cruise control
- Supports collision avoidance
- Torque vector control
- Traction control
- Trail control
- Trailer sway control
- Trail one pedal drive
- Trail turn assist
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.
Curve control enhances then vehicle's ability to follow the road when cornering severely or avoiding objects in the roadway.
Some vehicles are equipped with an EBB unit. The EBB replaces the vacuum brake booster and master cylinder with an electric motor and linear actuators to assist with vehicle brake applications.
The drive away release function automatically releases the electric parking brake once certain conditions have been met.
The EBD system helps maintain vehicle control by keeping a balanced braking condition between the front and rear wheels.
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 ESC system helps prevent skids or lateral slides by modulating brake fluid pressure to individual brake calipers and reducing engine torque.
The hill start assist feature is designed to assist the driver during hill-starts. Using the ABS, the hill start assist system holds the vehicle on an incline for a short time, allowing the driver to release the brake pedal and press the accelerator pedal without needing to use the parking brake.
The RSC system helps prevent excessive vehicle roll by modulating brake fluid pressure to individual brake calipers and reducing engine torque.
The selectable drive mode system helps maintain vehicle traction by adapting the responses of the engine, transmission, AWD system, the EPAS system, the ABS and the stability control system to the demands of the terrain.
The ABS supports the adaptive cruise control system by applying the brakes as necessary to maintain the distance gap set by the driver. For information on the adaptive cruise control system, Refer to: Cruise Control - System Operation and Component Description .
The ABS supports the collision avoidance system by monitoring information and precharging the brake system allowing the vehicle to stop in the shortest distance possible. For information on the collision avoidance system,
Torque vectoring control applies brake torque on the inner driven wheel in a curve for better traction to avoid an understeer, or oversteer situation.
The traction control system helps prevent loss of traction by reducing drive-wheel spin during acceleration.
The trail control feature maintains a set vehicle speed below 31 km/h (20 mph) in high range and below 15 km/h (10 mph) in low range.
The trailer sway control system helps maintain vehicle stability while towing a trailer by detecting and aiding in the reduction of conditions causing trailer sway.
The trail one pedal drive system assists when driving through difficult off-road terrain by allowing the driver to accelerate and brake using only the accelerator pedal.
Trail turn assist helps to reduce the turning radius of the vehicle by applying the brakes to the inside rear wheel in low-speed, high steering-angle maneuvers.
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.