1994 GMC Suburban Owner's Manual - Page 83

To release the parking brake: Hold the regular brake pedal down. Pull the lever, located just above the parking brake pedal, marked RELEASE to release the parking brake. If the ignition is on when the parking brake is released, the brake system warning light will go off. 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 your vehicle. of If you are towing a trailer and are parking any hill: See "Towing a on Trailer" in the Index. That section shows what to do first to keep the trailer from moving. Torque Lock The parking brake should be set first whenever you leave the driver's seat. If you are parked on a hill and the transmission is placed in " P ' (Park) before the parking brake is set, the weight of the vehicle may put too much force on the parking pawl in the transmission. It may be difficult to pull the selector lever outof "P" (Park). This is called "torque lock." To prevent this, the parking brake should be set BEFORE moving the gear selectorto "P" (Park). When preparing to move a vehicle parked on a hill, the selector lever should be moved out of "P" (Park) BEFORE releasing the parking brake. Even when on level surfaces, its a good idea to set the parking brake first before shifting the transmission from "P" (Park). If torque lock does occur,you may have to have another vehicle nudge your vehicle uphill a little to take some of the pressure off the transmission while you pull the selector lever out of T" (Park). 2-27