Posted 10/14/2021 15:06 (#9268800 - in reply to #9267871) Subject: RE: Trailer Air Brakes
Ontario Canada
It is a bad spring brake valve. When air is supplied to the spring brake valve it fills the brake chambers and air tank at the same time. When the air is released its supposed to just exhaust the air in the brake chambers, in your case something is bad in the valve and its dumping the tank as well.