Originally Posted by 96 Wideglide
Yeah, thats what I thought
Asked Meritor, and they say,' that can happen'. If it does'nt completely drain your tanks overnite, should'nt be a problem
Never heard of this or suspected it could happen. There is a check valve at the input to the wet tank which is first in line from the dryer. If it is functional then this shouldn't be possible. Maybe if the check valve is leaking pressure back toward the dryer, it causes the purge valve to cycle. They also call the purge valve the "unloader" valve so after it fires there should not be any pressure in the system behind the air tanks until the air governor turns on the compressor.
Next time you have service you might consider using a big truck shop & let them look at the air system. If you find out anything be sure to post.
I'm flummoxed and curious.
Full time since '07