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Air is secondary to deuce brakes, not primary to it. There is a failsafe and the brakes function without air. This does not require DOT approved unless you're pulling a full air brake air brake trailer. Just like horns, air seats, PTO switches and such, where after the protection valve...

I don't think I could envision myself removing good copper for nylon... Possibly replacement with nylon simply for the ease of installation, but I can't think of another good reason. That'd be my choice if I were to do so. I think you're going to want half inch for the glad hand plumbing...