Traction Control: Anti-Lock: Description

CAUTION: See ANTI-LOCK BRAKE SAFETY PRECAUTIONS article in GENERAL INFORMATION.

Anti-Lock Brake System (ABS) operates on all 4 wheels. ABS operation is controlled by the Electronic Hydraulic Control Unit (EHCU). The EHCU receives input signals from wheel speed sensors to monitor wheel speed. If EHCU determines a wheel is about to lock, hydraulic pressure is adjusted to maintain optimum braking. ABS system consists of an EHCU, "G" sensor/accelerometer, hydraulic unit, ABS warning light, wheel speed sensors, and proportioning and by-pass valves.

Under normal driving conditions, the Anti-lock Brake System functions the same as a standard power assisted brake system. However, with the detection of wheel lock-up, a slight bump or kick-back will be felt in the brake pedal. This pedal "bump" will be followed by a series of short pedal pulsations which occurs in rapid succession. The brake pedal pulsation will continue until there is no longer a need for the anti-lock function or until the vehicle is stopped. A slight ticking or popping noise may be heard during brake applications when the Anti-lock features is being used. When the Anti-lock feature is being used, the brake pedal may rise even as the brakes are being applied. This is also normal. Maintaining a constant force on the pedal will provide the shortest stopping distance.

NOTE: For additional information on brake system, see DISC & DRUM article.