1995 GMC Yukon Owner's Manual - Page 143

You will see this light flash for a few seconds when you turn your ignition to RUN or START. Then the light should go out. This means the system is ready. If the air bag readiness light doesn't come on when you start your vehicle, or stays on, or comes on when you are driving, your air bag system may not work properly. Have your vehicle serviced right away. Brake System Warning Light 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. This light should come on briefly 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.) A CAUTION: Your brake system may not be working properly if the brake system warninglight is on. Driving with the brake system warning light on can leadto an accident. If the light is still on after you've pulled off the road and stopped carefully, have the vehicle towedfor service. 2-7 1