I had an air leak due to not having on of the lines seat properly. Air bled off over about a 12 hr. period. Reseated the airline and have not had a problem since.
So another good test to perform is to see if the suspension holds air over several days.
My suspension has yet to drain it self prior to or now after the valve installation if I don't dump the air.
I just did about an 8000+ mile trip with the valves installed and just love how it has stabilized the handling of the coach in turns.
We like taking the back roads and can now take every turn and or even slightly exceed the recommended speed limit. Maintaining the recommended speed is something I did not even have to attempt prior to installing the valves.
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Harry
2015 Tuscany 40 KQ
2013 Honda CR-V