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. You might put a few drops of Marvel Mystery Oil in the IN line on the treadle valve. Love Tap might work too, but if it is a rubber o-ring going south a few drops of really thin oil could help.

. So it is really strange... Both of my S&S trucks have exhaust vents on the front gladhand covers. My M936 has stamped steel (rather than aluminum) gladhand covers and there are NO vents on those stamped pieces of metal. I went out back to look and took a picture and the back of the gladhand...

. So, now we have a problem. The yellow painted gladhand has the words "service" typed above the picture. Your wording says "emerg" in post #6. I'm thinking one of those statements are wrong. OR the wrong part is on one truck or the other.