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 for the first 500 miles (805 km):

   • Do not drive at any one constant speed, fast or slow.
   • Do not exceed 70 mph (113 km/h).
   •  Do not make full-throttle starts; also refrain from using the full throttle while driving. Avoid downshifting to brake or slow the vehicle.
If these break-in procedures are not followed, the vehicle's engine, axle, or other parts could be damaged.

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.

Following break-in, engine speed and load can be gradually increased.