Brake

When the ignition switch is turned to the RUN position the BRAKE warning lamp will come on for approximately 3 seconds. If the parking brake is set, the lamp will remain on. The lamp may also be illuminated by information from the Electronic Brake Control Module (EBCM) to the Electronic Brake/Traction control Module (EBTCM).
The BRAKE warning lamp may be activated by the brake combo valve when the ignition switch is turned to one of the following positions:
^ RUN
^ BULB TEST
^ START

For more information, refer to Engine Electrical.