We have a brand new international MV bobtail at work. The air doesn’t seem to be blowing off? Truck is brand new and it builds air pressure normally and cuts out at 120psi but makes absolutely no noise. You can’t hear the governor but its clearly doing its job. When going down the highway and governor cuts out, it makes some awful noise (sounds like a broken fan and is pretty damn loud). Anyone have any idea what it might be? It never blows off even when truck is sitting idle and parked. Since we bought it I’ve never heard it once. We have 8 other bobtails (a few INTL) and all of them blow off when governor cuts out.

