GM Service Manual Online
For 1990-2009 cars only
  1. Flush the hydraulic brake system at each bleeder valve.
  2. Open the valve 1 ½ turns.
  3. Force brake fluid through the pipes, the hoses and the bleeder valves until the brake fluid comes out clear in color. Refer to Antilock Brake System Automated Bleed Procedure .
  4. Inspect the master cylinder fluid level after you flush at each bleeder valve.
  5. Refill the master cylinder as required. After you flush, fill the master cylinder to the correct fluid level. Refer to Master Cylinder Reservoir Filling .