Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 74 (INSTRUMENT PANEL - ANALOG)OPERATIONINDICATOR LIGHTSBRAKE
1999 GMC Forward Control 5.7 R, Automatic
Indicator Lights: Brake
1999 GMC Forward Control 5.7 R, AutomaticSECTION 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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.