2003 GMC Sierra 1500 Pickup Owner's Manual - Page 195

Brake System Warning Light With the ignition on, the brake system warning light will flash when you set the parking brake. The light will flash if the parking brake doesn't release fully. If you try to drive with the parking brake engaged, a chime will sound when the vehicle speed is greater than 3 mph (5 km/h). Your vehicle's hydraulic brake system is divided into two parts. If one part isn't working, the other part can still work and stop you. For good braking, though, you need both parts working well. If the warning light comes on and a chime sounds there could be a brake problem. HaVE? your brake system inspected right away. This light should come on briefly when you turn the it ignition key to RUN. If it doesn't come on then, have fixed so it will be ready to warn you there's a problem. if If the light comes on while you are driving, pull off the road and stop carefully. You may notice that the pedal is harder to push. Or, the pedal may go closer to the floor. It may take longer to stop. If the light is still OD have the vehicle towed for service. See Towing Your Vehicle on page 4-53. 1 BRAKE I Your brake system may not be working properly if the brake system warning light is on. Driving with the brake system warning light on can lead to an accident. If the light is still on after you've pulled off the road and stopped carefully, have the vehicle towed for service. United States Canada 3-40