cxn613 Posted November 27, 2018 Share Posted November 27, 2018 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 Quote Link to comment https://www.bigmacktrucks.com/topic/54904-air-leaking-from-treadle-valve/ Share on other sites More sharing options...
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