Anti-Lock Brake System: Operation: Notes

The EBCM is located behind glove box. Wheel speed sensors transmit a small AC voltage signal about wheel acceleration, deceleration and slip value to EBCM. The EBCM controls braking by activating and deactivating electromagnetic modulator valve.

The modulator valve consists of 3 rapidly switching solenoid valves, accumulator chamber and a return pump. The valves increase and decrease brake fluid pressure to each wheel (rear wheels are one circuit) to prevent wheel lock-up.

The modulator valve can supply only as much fluid pressure as applied by the driver through the master cylinder. The modulator valve alone cannot apply the brakes.

When ignition switch is turned to RUN position, amber ANTI-LOCK warning light on instrument panel will glow. After engine is started, light goes out with battery warning light. If ABS warning light fails to go out or comes on while driving, a system fault is indicated.