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<p>[QUOTE=&quot;D.Tibbitt, post: 12276448, member: 114099&quot;]If you can find where you are losing that air supply . you should be able to narrow down where the problem is at. It almost sounds as if there is a blockage somewhere. Maybe a piece of debris inside the lines or a kink. Im not sure testing pressure at the gladhands would tell you much because it sounds more like a flow problem than a pressure problem... Although a simple way to check pressure would be to use a spare gladhand and find a air pressure gauge with male threads that can thread into the female side of the glad hand then connect glad hand to the red gladhand on the truck side. (Like ur hooking up a trailer or like ur hooking up a gladhand tire inflator hose)....</p><p><br /></p><p>&nbsp;But if the brakes work fine as well then i wouldnt think it would be a tank problem either because all that air to the brakes is supplied from the trailer tank... There has to be a blockage on the supply line somewhere. It is either in the valves itself or in the line... And if u have replaced all the valves then it has to be the lines... I think if it is supplying air to the tank at a normal rate when u press the brakes and bleed it down, the problem is most likely after the tank itself.. Maybe a piece of rust inside the tank has made its way into the supply&nbsp; lines to airbag and leveling valve... Something as simple as unhooking the leveling valve airline and&nbsp; supplying air pressure to the&nbsp; lines (pressing in red knob, make sure wheels are chocked)may be enough to clear the blockage if their is one.... </p><p><br /></p><p>Just thinking out loud here. Hopefully this can help u a bit. Let us know what u discover[/QUOTE]</p><p><br /></p>

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