GM Service Manual Online
For 1990-2009 cars only

Checks

Action

Check for a faulty air brake valve.

Refer to Air Brake Application Valve Operational Check .

Check if the air line leaks.

Refer to Air Brake System Leak Test .

Check the spring brake chamber hose for leaks.

Refer to Air Brake System Leak Test .

Check the compressor and the governor for leaks.

Refer to Air Compressor Governor Valve Diagnosis .