1994 GMC Suburban Owner's Manual - Page 123

Waiting to do repairs can be costly - and even dangerous. So please get to know your warning lights and gages. They're a big help. Brake System Warning Light The red brake system warning light is located at the bottom right corner of the instrument cluster 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, there couldbe a brake problem. Have your brake system inspected right away. This light should come on as you start the vehicle. If it doesn't come on then, have it fixed so it will be ready to warn you if there's a problem. 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 on, have the vehicle towed for service. (See"Towing Your Vehicle" in the Index.) The brake system warning light will also come on when you set your parking brake, and it will stay on if your parking brake doesn't release fully. If it stays on after your parking brake is fully released, it means you have a brake problem. 2-67