For 1990-2009 cars only
- Charge the air system to full pressure.
- Turn off the engine.
- Apply a soap solution around the cap of the valve (4).
- Check for soap bubbles indicating leads. A one inch bubble in three seconds or longer is acceptable.
- Drain the air pressure from the delivery port and remove the air line connected to the port.
- Apply a soapy solution around the delivery port. A one inch bubble in five seconds or more is acceptable.
- If excessive leakage is present, replace or overhaul the valve (4). Refer to Air Brake System Description and Operation .
