Anti-Lock Brake System - With TCS: Operation: Abs

As vehicle is driven, each wheel speed sensor sends an AC signal to ABS/TCS control unit. As brake pedal is depressed, ABS/TCS control unit starts to monitor vehicle rate of deceleration. If rate of deceleration is greater than preprogrammed amount, ABS/TCS control unit signals hydraulic control unit solenoid valves to regulate brake hydraulic pressure. Solenoid valves increase or decrease hydraulic pressure to each front wheel and/or to both rear wheels. This action will slow each wheel at a preprogrammed rate to prevent wheel lock-up, allowing driver to maintain steering control.

If ABS malfunction occurs, ABS warning light in instrument cluster panel will come on. ABS/TCS control unit will then deactivate ABS system, leaving conventional braking system intact. ABS/TCS control unit can also self-diagnose ABS during each ignition cycle (OFF-ON-OFF). If an ABS fault is detected, ABS/TCS control unit will store a trouble code to assist technician in diagnosing ABS.