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Home >> GMC >> 1990 >> Forward Control 6.2 J, Automatic, 400/M40 >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - Standard & Electronic >> Description & Operation >> Brake Warning Light System Operation >> All Models

All Models

Warning system consists of a warning light on instrument cluster/panel, a brake warning light/pressure differential switch (located on brake combination/proportioning valve) and a parking brake engagement telltale switch. If brake hydraulic system malfunctions, or if parking brake is NOT fully released, warning light will illuminate.