1994 GMC Suburban Owner's Manual - Page 82

I NOTICE: If you skip more than one gear when you downshift, or if you race the engine when you downshift, you can damage the engine, clutch or transmission. Locking RearAxle If you have this feature, your rear axle can give you additional traction on snow, mud, ice, sand or gravel. It works like a standard axle most of the time, but when one of the rear wheels has no traction and the other does, the locking featurewill allow the wheel with traction to move the vehicle. 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. 2-26