Spring Brake Valve Malfunction?

It is midnight, Saturday morning, and I can't go anywhere. I am stuck because of this valve malfunctioning. When I release the trailer break this is what's going on. It's 28° so I don't know if that is the problem or if it's the actual valve that's malfunctioning in general.

Видео Spring Brake Valve Malfunction? канала UsedFieroParts