2009 GMC Yukon Owner's Manual - Page 148

Parking Brake A chime sounds and the warning light flashes when the parking brake is applied and the vehicle is moving at least 5 mph (8 km/h). To release the parking brake, hold the regular brake pedal down. Then pull the bottom edge of the lever with the parking brake symbol, located above the parking brake pedal. If the ignition is on when the parking brake is released, the brake system warning light goes off. Notice: Driving with the parking brake on can overheat the brake system and cause premature wear or damage to brake system parts. Make sure that the parking brake is fully released and the brake warning light is off before driving. If you are towing a trailer and are parking on any hill, see Towing a Trailer on page 4-52. For vehicles with a release handle, set the parking brake by holding the regular brake pedal down, then pushing down the parking brake pedal. If the ignition is on, the brake system warning light will come on. See Brake System Warning Light on page 3-40. 2-42