GM Service Manual Online
For 1990-2009 cars only

The brake warning system consists of two lamps in the instrument cluster:

    • The red brake warning lamp
    • The amber antilock indicator lamp

The brake warning lamp indicates that a low fluid pressure condition exists in the brake system when the brake warning system finds ground through the pressure differential switch in the combination valve. The brake warning system also indicates that the parking brake is applied when the brake warning system finds ground through the parking brake switch. Refer to Brakes for additional information on the brake warning lamp operation.

The antilock lamp serves as an indicator of four-wheel antilock system operation and malfunctions. A bulb check is done each time the ignition switch is turned to the RUN position. The lamp should turn on and remain on for about 2 seconds.