For 1990-2009 cars

1. Block the wheels.
2. Remove the valve (2).
3. Plug the delivery port.
4. Connect an air supply to one of the supply ports. Apply approximately 861 kPa (125 psi) of air pressure.
5. Apply a soap solution to the opposite supply port.
6. Check that the leakage is less than a 25 mm (1 in) bubble in 5 seconds.
7. If the leakage exceeds these specifications, replace or overhaul the valve. Refer to Air Brake Double Check Valve Replacement or Air Brake System Description and Operation .
8. Disconnect the air supply.
9. Repeat steps 4 through 6 on the other supply port.
10. Shut off and disconnect the air supply.
11. Unplug the delivery port.
12. Install the valve (3).
13. Charge the air supply.
14. Check the brakes.
15. Remove the wheel blocks.