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Open a bleeder and you should have no brake drag. That should be your next move. Also, I would look into the master cylinder with a flashlight. You should be able to see 2 tiny holes and actually see fluid move when you press then release the brake pedal. And water at the bottom or debris...

Does it move with no air pressure built up?

That is a possibility.

As a test, you can remove the plug on the back of the air can and see if air pressure builds with your finger over the hole. It should not, with the truck aired up and sitting still(no brake pedal applied). In an emergency, you can bleed off a little air with the left rear gladhand opened...

Your air-pack needs to be rebuilt.