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You cant block off either gladhand in front. If the blue cant breathe your brakes wont release. If the check valve going to the red one leaks you can release your parking brakes and the truck can roll away. You can eliminate the connection to spring brake release circuit on the red one and then...

Tractor valve with a bad diaphragm can cause air to come out of odd places. I dont have much a1 experience though. What motor does it have? Early A1 has 3126. 3116 would be first gen.

Sounds like a bad air connection or broken line somewhere.

Just to clarify. When the truck takes away air from the spring brakes, it sends air to the service brakes (non spring like the fronts) which are in the same chamber housing. So just because you have air at the cans does not mean you have air at the spring brakes. I have heard of dash valves...

Maybe your trans/tcase is having an issue not allowing the drivetrain to move. If you have air at your brake chambers maybe they are releasing.

Could you have a hole in a chamber diaphragm not allowing air to release the brake?

The tm has troubleshooting steps but no full diagram that I have seen.

The gladhands don't function for air supply unless you activate the trailer control dash valve above the parking brake. There is a small check valv behind the fron grill its plumbed to the passenger side front gladhand. That's a popular culprit when brake release issues arise. I don't believe...

Plugged up front gladhands