[Wanderman]

Yesterday I had  the rest of the tires replaced.

While the drives were off I pulled the lanyard to empty the wet tank in the back. Not much water.. a puff of rust and it didn't seal well.. as is normal with those valves. I pulled and cajoled until I thought it was sealed. It wasn't.

Today I saw the left side (driver's) completely aired down, but the right side (Passenger's was perfectly fine and holding air.

I am thinking this may help me diagnose the leak I believe I have in the check vale(s)

Experts chime in!

[Wanderman]

So if the wet tank valve is leaking and the left side (driver's) of the coach goes flat but NOT the right (passenger), what does that tell us?

[Richard]

Nothing.

What check valves do you refer to?

Your best bet for getting a clue is to temporarily install the isolation tool between the six pack and the left air line.