01-13-2022, 09:13 AM
Actually, the 'main' tank is the 'Aux'. The brake tanks are two separate tanks located behind and above the front axle (at least on our coaches) that have check valves to prevent them from leaking down as the pressure in the 'Aux' tank drops. What that tells me is that the brake tanks and circuits for the moment can be disregarded in your search for air leaks.