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 MANUALSCHEVROLET1990STEP VAN 5.7 K, AUTOMATIC, 3L80/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCRUISE CONTROL SYSTEMSCRUISE CONTROL SYSTEM - VACUUM SERVODESCRIPTION & OPERATIONBRAKE ELECTRICAL RELEASE SWITCH OPERATION
1990 Chevrolet Step Van 5.7 K, Automatic, 3L80/M40
Brake Electrical Release Switch Operation
1990 Chevrolet Step Van 5.7 K, Automatic, 3L80/M40SECTION Brake Electrical Release Switch Operation
Sometimes combined with stoplight/torque converter clutch switch, switch is mounted on brake pedal bracket. See Figure. When brake pedal is pressed, electrical current to cruise control module is interrupted, causing system to disengage.
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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.