Solenoid Valve Pressure Release Test
- Raise vehicle on frame contact hoist so that wheels to be tested are off ground.
- Select SOLENOID TEST. Select wheel circuit solenoid to be tested. If testing rear axle valve, ensure vehicle is in Neutral.
- Apply brake and hold, have assistant verify that wheel cannot be turned by hand. Press DOWN arrow. Verify that assistant can turn selected wheel by hand. Display on TECH 1 should change from OFF to ON, indicating pressure release has been commanded properly.
- After 15 seconds, display will change back to OFF. Verify that selected wheel is now locked. Repeat test if necessary to verify proper operation. Perform SOLENOID VALVE PRESSURE HOLD TEST if not yet completed.
Courtesy of GENERAL MOTORS CORP.