1996 GMC Savana Van Owner's Manual - Page 106

Brake System WarningLight 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 could be a brake problem. Have your brake system inspected right away. 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.) BRAKE Your brake system may not be working properly if the brake system warning light is on. Driving on with the brake system warning light can lead to an accident. If the lightis still 0.n-after you've pulled off the road and stopped carefully, have the vehicle towedfor service. When the ignition is on, the brake system warning light will also come on when you set your parking brake. The light 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. United States Canada This light should come on briefly when you turn the ignition key to RUN. If it doesn't come on then, have it fixed so it will be ready to warn you if there's a problem.