Call Monaco ((877) 466-6226) to find out your ride height... probably 7.5" metal plate to metal plate. You will spend a fair amount of time finding that small of a air leak. I would be happy if my dump truck held air that well, but most will say it's not normal. More importantly how well does it hold air when you put the brakes on hard without the engine running and not letting up on the brake pedal?
Before buying a new filter for the air dryer, hook it back up and see what happens as someone disconnected it for a reason... probably a leak that they could not stop. There's more to the air dryer than just a line in/out. Hopefully it's a
Meritor style if you have to replace.
