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Just unscrew that valve/cap or remove the dummy coupling entirely from the truck temporarily so it doesn't swing around, take her for a spin and see if that fixes the problem. If so, either ditch the valve/cap, see if you can clean it or just get a shiny new one. If you really want a new one...

Do you have just a dummy with a hole or does the dummy have the little covered vent screwed into it? If so, unscrew the little vent, put the dummy back on and take her for a spin and see. My issue was that tiny valve got a hunk of crud in it and was plugged. Hit it with some brake cleaner to...

kendelrio Check the vent on the front passenger dummy glad hand. That is a vented cover. If that vent gets plugged by a mud wasp, debris, etc. the system cannot exhaust properly and will lock up your rears as you describe. Happened to me once and now I always check for that on my pre-trip...