GM Service Manual Online
For 1990-2009 cars only

It is recommended that the propshaft-mounted parking brake be burnished as part of the new vehicle break-in. The parking brake will work best after it has been burnished following these instructions:

  1. Make 10 stops, using the parking brake hand lever, from 20 mph (32 km/h) about 2 1/2 miles (4 km) apart.
  2. Between stops, drive the vehicle at 20 mph (32 km/h).