2003 GMC Safari Owner's Manual - Page 105

All-Wheel Drive If your vehicle has all-wheel drive, your engine's driving power is sent to all four wheels for extra traction when needed. This is like four-wheel drive, but there is no separate lever or switch to engage or disengage the front axle. It is fully automatic, and adjusts itself as needed for road conditions. You may experience a brief vehicle vibration upon acceleration when driving in slippery conditions. This is normal and is an indication that the all-wheel drive system is functioning properly. Parking Brake 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. To release the parking brake, hold the regular brake pedal down. Pull the brake release lever located on the lower left side of the steering column. Notice: 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. If you are towing a trailer and are parking on a hill, see Towing a Trailer on page 4-31. That section shows what to do first to keep the trailer from moving. 2-26