Brake System

PURPOSE OF THE ABS
This vehicle has an Antilock Brake System (ABS) which controls the front and rear disc brakes to minimize wheel lockup during heavy braking on most road surfaces.

SPECIALIZED COMPONENTS
The ABS utilizes a diagonally split master cylinder and tandem power booster, which are similar to those used in non-antilock systems. The system also includes a pressure modulator valve assembly, electronic brake control module (electronic brake and traction control module, on vehicles equipped with traction control), wheel speed sensors, and rear-mounted proportioner valves.

ABS COMBINED WITH CONVENTIONAL BRAKE SYSTEM
Using a conventional diagonally split brake system plus an ABS unit, the brake system operates normally while the ABS monitors wheel speeds and brake pedal position.

Conventional Braking Mode
The conventional system will continue to operate normally until the control module detects a wheel beginning to lock up or the brake pedal traveling beyond a specified limit. When either of these conditions exists, the brake system switches from a normal, conventional braking mode to the antilock mode. The ABS will then remain in control of the system until braking is no longer occurring, or the wheel locking and for excess pedal condition no longer exists. Brake pedal operation and feel during normal braking is like that of a conventional vacuum-boost brake system.

Antilock Braking Mode
When the system is in the antilock mode, a series of rapid pulsations might be felt in the pedal, and the pedal might even rise a little. This is normal and should not be of concern. Additional normal characteristics of the brake system while operating in the antilock mode include a ticking or slight popping noise which might be heard coming from the pressure modulator valve assembly. Initialization of the (ABS) pump may be heard at approximately 10 km/h (6 mph). During antilock braking on dry pavement, the tires may make intermittent chirping noises as the wheel(s) approach lockup.