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 MANUALSBUICK1991LESABRE LIMITED, 4D SEDAN, 4T60/ME9REPAIR AND DIAGNOSISELECTRICALGAUGESINSTRUMENT PANEL - ANALOGTESTINGBRAKE SYSTEM WARNING INDICATOR TEST
1991 Buick LeSabre Limited, 4D Sedan, 4T60/ME9
Brake System Warning Indicator Test
1991 Buick LeSabre Limited, 4D Sedan, 4T60/ME9SECTION Brake System Warning Indicator Test
- If brake system warning indicator remains off, check for blown fuse. If brake indicator remains on with ignition switch in RUN position and parking brake off, check for defective parking brake switch or leak in one of the brake systems.
- Verify leakage by removing electrical connector from brake pressure switch. If indicator goes out, brake pressure switch is closed (low pressure in one system). Repair as necessary. If indicator remains on, check for short in parking brake switch, ignition switch or wiring.
- If brake indicator comes on when ignition switch is in START position, but not when parking brake is applied, measure voltage at parking brake switch Tan/White wire (with ignition switch in RUN position and parking brake applied).
- If battery voltage exists at Tan/White wire, replace parking brake switch. If no voltage exists at Tan/White wire, check for open in wire between switch and bulkhead connector on firewall.
- If brake indicator comes on with parking brake applied, but not when ignition switch is in START position, check for voltage at ignition switch START terminal. If battery voltage exists, replace ignition switch. If battery voltage is not present, check for open in Tan/White wire between ignition switch and bulkhead connector.
- If brake indicator does not come on with low brake accumulator pressure, check for battery voltage at Tan/White wire of brake accumulator pressure switch. If voltage is not present, replace 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.