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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (Disc Brakes & Drum Brakes) >> Testing >> Brake Warning Light >> Warning Light Switch

Warning Light Switch

WARNING: This page does not describe the selected car, but rather 46 other vehicles, including the 2001 Pontiac Montana, 2001 Pontiac Aztek, 2001 Oldsmobile Silhouette, 2001 Oldsmobile Bravada, and 2001 GMC Sonoma. 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). On all models except Astro and Safari, 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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