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I would go ahead and check the service or TM manual and make sure all your hoses on the brake valve are hooked up correctly. One hose in the wrong spot could cause your problems or at least make your air act weird.

Yes you should have air at the park/ emergency glad hand if you release the trailer brake dash valve if you do not have air there you have some kind of problem.

Most likely they had the brake chambers caged because it made it easier to move unit around the yard without building air. You can check the chambers by taking the service brake line off the chamber and releasing the brakes and see if air comes out the fitting on the chamber which it should not...

Your tractor protection valve should not come into play unless you have the trailer brakes released or the trailer brake button on the dash pushed in. If memory serves me correct. If you are connected to a trailer and releasing its brakes then you could have a leak on the park cylinder inside a...