For 1990-2009 cars

### Removal Procedure

1. Apply the parking brake.
2. Block the wheels.
3. Drain all the reservoirs. Refer to Draining Reservoirs .
4. Tag or label the air lines for later installation.
5. Disconnect the air lines from the valve. Refer to Hose and Line Replacement - Nylon and Metal Compression .
6. Remove the pin (4).
7. Remove the knob (3).
8. Remove the nut (5).
9. Remove the washer (6).
10. Remove the valve (2).
11. Inspect the air lines for damage or deterioration. Repair the air lines as needed.
12. Check the valve (2) for cracked, loose, or missing line clips or ties. Repair the line clips or the ties as needed.

### Installation Procedure

1. Connect the air lines to the valve. Refer to Hose and Line Replacement - Nylon and Metal Compression .

Install the valve (2).

2. Install the washer (6).
3. Install the nut (5).
4. Install the knob (3).
5. Install the pin (4).
6. Start the engine.
7. Charge the system air pressure to the governor cut-out point.
8. Stop the engine.
9. Check for air leaks using a soap solution.
10. Check for proper operation.
11. Remove the wheel blocks.