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Home >> GMC >> 1993 >> C3500 HD 5.7 K, Automatic >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc & Drum Brake System >> Testing >> Brake Warning Light >> Electrical Circuit

Electrical Circuit

Disconnect wire from switch terminal on combination valve. Connect wire to ground. Turn ignition on. If brake warning light does not come on, repair brake warning light bulb or wiring circuit. If light operates, brake warning light electrical circuit is okay.

NOTE: On Astro and Safari, system is not equipped with pressure differential switch.
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