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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSA/T - DIAGNOSING CONVERTER LOCK-UP PROBLEMSTEST # 4 - ADJUSTING/REPLACING THE BRAKE SWITCH
1990 Chevrolet Lumina APV V6-191 3.1L
Test # 4 - Adjusting/Replacing the Brake Switch
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Test # 4 - Adjusting/Replacing the Brake Switch
TEST # 4
ADJUSTING REPLACING THE BRAKE SWITCH
^ Remove the brake switch from its bracket.
^ Reconnect the wires to the brake switch.
^ Re-test as stated in test # 2, but push and release the plunger with your finger or thumb.
^ If it now passes the test, the brake switch is good, but needs adjusting.
^ If it still doesn't pass, replace the brake switch.
ADJUSTING REPLACING THE BRAKE SWITCH
^ Remove the brake switch from its bracket.
^ Reconnect the wires to the brake switch.
^ Re-test as stated in test # 2, but push and release the plunger with your finger or thumb.
^ If it now passes the test, the brake switch is good, but needs adjusting.
^ If it still doesn't pass, replace the brake switch.
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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.