For 1990-2009 cars only
- Apply the parking brake.
- Block the wheels.
- Run the engine in order to fully charge all service reservoirs.
- Turn off the engine.
- Drain the air pressure from the supply reservoir. Refer to Draining Reservoirs .
- Disconnect the air line on the supply side of the valve (10).
- Apply a soap solution to the open supply port of the valve (10).
- Verify that leakage is less than a 25 mm (1 in) bubble in 5 seconds.
- If the leakage exceeds this amount, drain the air pressure from all reservoirs and replace the valve (10).
- Connect the supply port air line.
- Start the engine.
- Charge the air system to the governor cut-out point.
- Connect the supply port air line.
- Check the brake operation.
- Remove the wheel blocks.
