2003 Chevrolet Avalanche Owner's Manual - Page 316

Level Control Self-Adjusting Things you put inside your vehlcle can strike and injure people ina sudden stop or turn, or in a crash. Put things in the cargoarea o your f vehicle. Try to spread the weight evenly. Never stack heavier things, like suitcases, inside the vehicle that some of them so are above the tops f the seats. o Don't leave an unsecured child restraint in your vehicle. When you carry something inside the vehicle, secure it whenever you can. Don't leave a seat folded down unless you need to. The self-adjusting rear suspension is available on C/K 1500 vehicles and is available with the premium smooth ride suspension package. This type of level control will provide a leveled riding position as well as improved handling under a variety of passenger and loading conditions. A hydraulic pump inside each rear shock absorber raises the rear of the vehicle to the proper height, based on inputs from the road surface, while the vehicle is being driven. It take approximately 2 miles (3.2 km) of driving for the leveling to complete, depending on the road surface conditions. If the loaded vehicle is not moved for approximately 12 hours, the leveling system may bleed down to a lower height. This can be especially apparent if a trailer is left attached to a parked vehicle for long periods of time. The vehicle must be driven to re-level the vehicle. There's also important loading information for off-road driving in this manual. See Loading Your Vehicle on page4-5 1. If a self-equalizing hitch is being used, the vehicle should be driven approximately 2 miles (3.2 km) with the trailer prior to adjusting (leveling) the hitch. 4-53