ABS System Components

CAUTION: Refer to ABS Component Handling Caution in Cautions and Notices.

The ABS brake modulator system consists of a conventional hydraulic brake system plus anti-lock components. The conventional brake system includes a vacuum booster, master cylinder, front disc brakes, rear drum brakes, rear drum brakes, interconnecting hydraulic brake pipes and hoses, brake fluid level sensor, and the brake warning lamp indicator.

The ABS components include a hydraulic unit, an Electronic Brake Control Module (EBCM), system fuse, 4 wheel speed sensor at each wheel, interconnecting wiring, ABS indicator, The de-coupled dynamic rear proportioning (DDRP) indicator, which is connected to the parking lamp, and the rear drum brakes. See ABS Component Views for the general layout of this system.

The hydraulic unit with the attached EBCM is located between the surge tank and the fire wall on the left side of the vehicle.

The basic hydraulic unit configuration consists of the hydraulic check valves, 2 solenoid valves for each wheel, a hydraulic pump, 2 accumulators, and 2 dampers (Delphi system only). The hydraulic unit controls the hydraulic pressure to the front calipers and the rear wheel cylinders by modulating hydraulic pressure to prevent wheel lockup.