Brake Warning System
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1999 GMC Yukon, 1999 GMC Suburban, 1999 GMC Pickup, 1999 GMC Cab & Chassis, and 1999 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Warning system consists of a warning light on instrument cluster/panel, a brake warning light/pressure differential switch, and a parking brake switch. Warning light comes on if brake hydraulic system malfunctions or parking brake is not fully released.