Indicator Lights: Brake

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Oldsmobile Bravada, 1999 GMC Sonoma, 1999 GMC Jimmy, 1999 GMC Envoy, and 1999 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

BRAKE Light Emitting Diode (LED) is controlled by Electronic Brake Control Module (EBCM) and Body Control Module (BCM) on Class 2 serial data line. LED illuminates when one or more of the following conditions exists:

Low brake pressure condition exists.
Low brake fluid condition exists.
EBCM cannot control ANTI-LOCK indicator.
Brake pressure differential switch is closed.
BCM sends Class 2 serial data message to instrument cluster indicating parking brake is set.
Instrument cluster receives Class 2 serial data message from EBCM requesting BRAKE indicator on.
As a check, LED illuminates for 3 seconds after ignition is turned on.