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Home >> GMC >> 1999 >> C3500 HD 7.4 J, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 875 (Disc Brakes - Rear - S & T Series) >> Testing >> Brake Warning Light >> Warning Light Switch

Warning Light Switch

WARNING: This page does not describe the selected car, but rather 12 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.
  1. Fill master cylinder reservoir. Attach bleeder hose to bleeder screw at either rear wheel. Immerse other end of hose in container of brake fluid. Turn ignition on.
  2. While depressing brake pedal, open bleeder screw (close bleeder screw before releasing pedal). If light comes on, go to next step. If light does not come on, switch is defective; replace combination valve.
  3. Close bleeder screw. Depress brake pedal with moderate to heavy pressure. If light goes out, switch is okay. If light stays on, switch is defective, replace combination valve. Repeat test on front brake system. System should function in same manner as rear.
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