Description & Operation
Vehicles with 2.2L engine are equipped with Rear Wheel Anti-Lock (RWAL) system. Rear wheel lock-up is prevented by regulating fluid pressure to rear wheel cylinders. Pressure regulating is adjusted by a control valve located under the master cylinder. Control valve is regulated by an RWAL Electronic Brake Control Module (EBCM) located next to master cylinder.
The EBCM receives signals from the stoplight switch and a speed sensor, located in the transmission. See Fig 1. Speed sensor signal is sent through a Vehicle Speed Sensor (VSS) buffer located behind glove box. If axle ratio or tire size is changed, VSS buffer must be replaced to match axle ratio or tire size as necessary.
The RWAL system is connected to the existing brake warning light on the instrument panel. When ignition is turned on, warning light should come on for about 2 seconds as a bulb test.