Re: No Air for Hadleys
Reply #1 –
You need to look at the air system diagram for that coach and see where the air horns get their air supply.
On our '93 U280, for instance, the air horn supply solenoid is T'ed off one of the air lines that feeds the dash air pressure gauge. That air line comes directly off the front brake tank (bypassing the protection valve). So, on our coach, any leak that depletes the pressure in the front brake tank will affect horn operation.
Your travel companion's coach may be plumbed in a similar manner, but the only way to know for sure is to consult the appropriate air system diagram.