09-26-2016, 06:00 PM
One my coach, the two brake tanks are in the front, directly behind and above the front axle. The supply tank (aka wet tank or Aux Tank) on my coach is located in the rear near the drive axle. All three tanks run E/W. There are one way valves on both front brake tanks to isolate them in case of a leak in the supply tank so they should be holding air as you indicated they are.