I traced a slow deflation of the suspension to an air dump solenoid in the engine compartment but have not been able to identify it. Gillig does not have any record so obviously Barth installed them (One in the front and one in the rear). They have a silver label that has weathered so only a few letters remain. I can read ...llows with a number that ends in 122. It is a 12 v switch connected to the air lines. If anyone has found these or can help me further identify them I would appreciate it.
Thanks