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I've never noticed my truck making this noise. Then again when I've had it out for a drive it's usually for its only drive for the day, so I immediately drain the air tanks after I park it. Next car show I take it to I'm going to have to remember to listen for this!

That's interesting... I wonder how much your truck's air gauge moves with each puff. Could it be a failing air pressure relief valve? I think there should be one at the air tanks.