GM Service Manual Online
For 1990-2009 cars only

Notice: Do not use alcohol for flushing the system or cleaning assemblies where alcohol could be trapped and contaminate the brake fluid. The contaminated fluid can then cause the failure of the rubber components in the system.

Flush at each bleeder valve. Flushing is similar to the bleeding procedure. The difference is that the bleeder valve is opened 1 1/2 turns. Fluid is forced through the lines and the bleeder valves until the fluid comes out clear in color. Refer to Hydraulic Brake System Bleeding .

Inspect the master cylinder fluid level after flushing each valve. Refill the master cylinder fluid as required. Ensure that the master cylinder reservoir is filled to the proper level after flushing. Refer to Master Cylinder Reservoir Filling .