Air Leak from Truck Height Control Leveling Valve Normal?

Sounds normal to me. It's always purging air when getting loaded or fighting to supply air are when you are getting unloaded. I don't think they are required to compensate for such drastic changes.

Wait until after the job is done and then do an "air test" to see if it's acceptable.

 

Leaking when being loaded/unloaded it normal..

 

Depends on where its leaking from? Break out the soapy water. Wiggle the lever and watch for leaks where the shaft enters the valve and all the fitting and air line joints. The only place leaking should be present is from the exhaust port during leveling out, as allready mentioned which is completely normal.

 

When you do your "leak down test" during your pretrip how
much air pressure do you lose?

 

Sounds like everything is fine. Since the leveling valve is connected
to the air bags "obviously" it is normal to hear air leaking during loading
and unloading. As long as the truck isn't leaking a significant amount of
air I would not worry to much about the leveling valve.

 

If it’s not leaking otherwise, except for loading and unloading, than it’s normal.

 

The problem I’ve had, is an old valve will tend to stick and seep, sometimes intermittently, taking a long time to settle. I had a DOT ask once, “ What’s that leak, leveling valve?