Anti-Lock Brake System: Operation: Notes

During normal driving and braking operations, ABS acts like a conventional braking system. Each Wheel Speed Sensor (WSS) constantly sends an AC voltage signal to the Controller Anti-Lock Brake (CAB), which then translates this information into wheel speed.

When CAB determines that wheel(s) are about to lock-up or slip, it activates appropriate valve in Hydraulic Control Unit (HCU) to increase or decrease hydraulic pressure to each wheel. A slight pulsation may be felt through brake pedal.

BRAKE, ANTI-LOCK and TRACTION CONTROL warning lights (if equipped) should come on when ignition is turned on and vehicle is started. If any instrument panel warning light stays on longer than about 5 seconds after vehicle is started, system malfunction is indicated. See DIAGNOSIS & TESTING.