2003 GMC Sonoma Owner's Manual - Page 106

Parking Brake The parking brake is located near the bottom of the instrument panel on the driver's side of the vehicle. To set the parking brake, hold the regular brake pedal down with your right foot. Push down the parking brake pedal with your left foot. If the ignition is on, the brake system warning light will come on. Nofice: Driving with the parking brake on can cause your rear brakes to overheat. You may have to replace them, and you could also damage other parts of your vehicle. To release the parking brake, hold the regular brake pedal down. Pull the BRAKE RELEASE lever fully. It is located on the bottom off the instrument panel on the driver's side of the vehicle. If you are towing a trailer and you must park on a hill, see Towing a Trailer on page 4-54. That section shows what to do first to keep the trailer from moving. 2-31