No brake fluid to rear wheel cylinders

A little trick if you don't want to ruin the metal lines if they are froze. buy and make sure they are correct before you do this. I cut the rubber hose,pop the c clip out,put a vice grip on the nut for the metal line and twist the rubber line off,once it's off you can hit it with some heat and lots of penetrating oil and repeat until it breaks free,sometimes tapping it a bit helps too or just twist the rubber line on if it won't break free.