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| Having issues with the trailer supply valve on my 1979 Peterbilt 359. I have air going to the supply side of the valve but cannot get air to go to the delivery side when I push the button. I have everything unhooked from it except the supply. I am on my third new valve assuming that valve is bad. Must be something else. Shouldn’t the valve let air through when I push in the button? What am I missing? | |
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Air brake valve issues
