2008 GMC Envoy Owner's Manual - Page 107

Parking Brake To set the parking brake, hold the regular brake pedal down with your foot and pull up on the parking brake lever located between the seats. If the ignition is on, the brake system warning light on the instrument panel cluster will come on. See Brake System Warning Light on page 3-38. Notice: Driving with the parking brake on can overheat the brake system and cause premature wear or damage to brake system parts. Verify that the parking brake is fully released and the brake warning light is off before driving. If you are towing a trailer and you must park on a hill, see Towing a Trailer on page 4-45. To release the parking brake, hold the regular brake pedal down. Pull the parking brake lever up until you can press in the button at the end of the lever. Hold the button in as you move the parking brake lever all the way down. 2-33