GM Service Manual Online
For 1990-2009 cars only

Notice: The vehicle does not need an elaborate break-in. But it will perform better in the long run if you follow these guidelines:

   • Let the engine warm up before you operate your vehicle under load.
   • Keep your speed at 55 mph (88 km/h) or less for the first 500 miles (805 km).
   • Do not drive at any one speed, fast or slow, for the first 500 miles (805 km). Do not make full-throttle starts.
   • Avoid making hard stops for the first 200 miles (322 km) or so. During this time the new brake linings are not 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.
   • Use the lowest gear you can when you start a loaded vehicle in motion and when going up hills to avoid overloading the engine.
   • Check and adjust engine and transmission fluid levels often and be sure tires are properly inflated for the load you are carrying.
   • When new, parking brake linings have not yet been broken in. When linings are new, it is possible that the vehicle could move while the parking brake is applied. Before using the parking brake on grades, follow the parking brake burnish procedure. See Parking Brake Burnish Procedure.
   • If you have a Caterpillar® diesel engine, see the Caterpillar® Diesel Engine Operation and Maintenance Manual.