Posted 7/28/2014 11:00 (#3989933 - in reply to #3989603) Subject: RE: Air brake trouble with older L 9000 Ford.
I would say you have a leak somewhere on the secondary that you can not hear over the engine... it happens. Like mabey a big bloody hole in the tank and that won't even hiss when it leaks. Been there, done that...
You should have a dryer, wet, primary and secondary and the wet and primary are probably bulkheaded in one tank. Also keep in mind that just about anything could have been changed on an old truck at this point...
Air brake trouble with older L 9000 Ford.
