1995 GMC Yukon Owner's Manual - Page 144

The brake system warning light will also come on when you set your ~r parking brake, and it will stay on if y o ~ parking brake doesn't release fully. If it stays on after your parking brake is fully released, it means you have a brake problem. Anti-Lock Brake System Warning Light With the anti-lock brake system, this light will come on when you start your engine and may stay on for several seconds. That's normal. If the light doesn't come on. have it fixed so it will be ready to warn you if there is a problem. If the light stays on, or comes on when you're driving, your vehicle needs service. If the regular brake system warning light isn't on. you still have brakes, but you don't have anti-lock brakes. If the regular brake system warning light i s also on, you don't have anti-lock brakes and there's a problem with your regular brakes. See "Brake System Warning Light" earlier in this part. 2-72