2001 GMC Sierra 1500 Pickup Owner's Manual - Page 101

New Vehicle "Break-In" NOTICE: Your vehicle doesn't need an elaborate "break-in." But it will perform better in the long run if you follow these guidelines: D Keep your speed at 55 mph (88 km/h) or less for the first 500 miles (805 km). D Don't drive at any one speed -- fast or slow -- for the first 500 miles (805 km). Don't make full-throttle starts. D Avoid making hard stops for the first 200 miles (322 km) or so. During this time your new brake linings aren't yet broken in. Hard stops with new linings can mean premature wear and earlier replacement. Follow this breaking-in guideline every time you get new brake linings. D Don't tow a trailer during break-in. See "Towing a Trailer" in the Index for more information. Ignition Positions You can use your key to turn your ignition switch to five different positions. ACCESSORY (A): ACCESSORY lets you use things like the radio, power windows and the windshield wipers when the engine is off. Push in the key and turn it toward you. 2-18