73 dart brake problems

Ya so I figured out the problem. It wasn't my son after all. It turns out that the rear brake hose has a hole in it and leaks fluid. I replaced both front brake hoses and I could not get the hose separated from the line, it was rusted on. I tried wd-40 and a torch but nothing. I ended up having to cut the metal line a ways from the hose because of the coragated line. Is there an easier way to do it for the back hose. I really don't want to cut the metal line again