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I would try to lube it. Not too much 2 small spurts then build air see if it opens and vents moisture at around 120psi. If you continue to have problems then do the rebuild.

I dont believe that kit has the rebuild kit for the expello valve which is whats sticking on yours. It just has the cover piece over the valve. Spray wd40 up into it and see how it goes I think they definetly need some lubricant from time to time. Haldex DQ6020 is the expello valve kit for the...

If air is coming out of the center of your air dryer or big component as you call it, stick your finger in the hole and push up. Sometimes a little wd40 helps to get it moving again. A rebuild kit is available for that valve.

I recently had to rebuild the unloader in one of my trucks. It would build air slowly if you revved it a little. There is an O-ring that had dried out. The rebuild kit is available from Fleetpride it was around 50 bucks. I had to take the compressor off to do it so if you head that route make...