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cxn613

air leaking from treadle valve

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What would cause air to back feed to treadle valve when truck is started?  If you hold brake peddle to the floor it will build air, as soon as you let off peddle it looses air right away out treadle valve. Treadle valve is new. I'm not at the truck as its at another location and looking for some advice before i make a trip to it. thanks

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