Antilock Brakes / Traction Control Systems: Description and Operation
Anti-Lock ControlABS With Traction Control
The ABS consists of the following components:
^ ABS module
^ Front wheel speed sensors
^ Front wheel speed sensor rings (integral to the front wheel bearing)
^ Hydraulic control unit (HCU)
^ Rear wheel speed sensors
^ Rear wheel speed sensor rings (integral to the rear wheel bearing)
^ Stability/traction control switch
The ABS prevents wheel lockup by monitoring the wheel speed sensors and actuating the HCU modulating the brake pressure to prevent wheel lockup. By preventing the wheels from locking up, the driver is able to maintain steering control and stop in the shortest possible distance under most conditions. The traction control system utilizes the same components as the ABS to prevent wheel spin and help maintain vehicle control during acceleration.
The front wheel speed sensor rings are integral to the front hub and bearing assemblies.
The rear wheel speed sensor rings are integral to the rear hub and bearing assemblies.