Front brakes won't release

Loosen the tube for the front right at the master. If they release, it's not hoses, or tubing, or prop valve/ distro/ warning switch. it is the MASTER. And as I suggested, CHECK whether that master has a residual valve, and if not, it has GOT to be something right there. Hell it might even be a defective master, I don't know what--Junk in there/ sticking piston? Mismatched parts? No idea.