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 MANUALSCHEVROLET1990G 30 VAN V8-305 5.0LREPAIR AND DIAGNOSISBRAKES AND TRACTION CONTROLANTILOCK BRAKES / TRACTION CONTROL SYSTEMSDESCRIPTION AND OPERATIONABS CIRCUIT DESCRIPTION
1990 Chevrolet G 30 Van V8-305 5.0L
ABS Circuit Description
1990 Chevrolet G 30 Van V8-305 5.0LSECTION ABS Circuit Description
WARNING LAMP OPERATION
The Rear Wheel Antil Lock (RWAL) system uses the existing BRAKE warning lamp in the instrument panel to indicate system operation and malfunctions. The BRAKE lamp is also used to show a hydraulic system pressure differential condition and parking brake operation.
NORMAL OPERATION
A bulb check occurs each time the ignition switch is turned "ON." The BRAKE lamp should light, remain on for about two seconds, then turn off. When system malfunctions occur, the BRAKE lamp will turn on and stay on until the malfunction is corrected. To determine the specific cause of a malfunction, refer to Diagnostic Circuit Test. Testing and Inspection / Procedures / Diagnostic Circuit Test
The BRAKE lamp will also light when the parking brake is applied or the combination valve switch is activated. Do not confuse these functions with an RWAL system malfunction.
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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.