Anti-Lock Brake System: Description

The Anti-Lock Brake System (ABS) consists of hydraulic unit, ABS control relay, brake actuator, four 3-position actuator solenoids, pump motor, deceleration sensor (All-Trac), ABS computer and 4 speed sensors. See Figure.

An ABS indicator light is located on the instrument panel in the combination meter. ABS indicator light comes on for 3 seconds as a bulb test when ignition is turned on. A primary check is performed after each engine start and initial vehicle speed exceeds 4 MPH. An actuator noise is heard as vehicle speed exceeds 4 MPH, this is normal. If brake pedal is depressed before vehicle exceeds 4 MPH, primary check will not occur until brake pedal is released.