Has anyone replaced all the Brakelines on a 1985 AMC Eagle Sedan? How Hard Is it?
No, I haven't, but is it as bad as on any old vehicle:
Bleeder nipples will break off and the couplings on the brake lines will get rounded of when you try to unscrew them.
If you have time, you could start a week before with JB Blaster on all nipples a couplings. Soak them every day if you can.
Before trying to unscrew them use a 2 pound hammer and a punch and hit them sideways in two directions, this will release thread in the bore.
Buy new rear wheel cylinders too: they cost next to nothing.
If you're working on the engine lines, they're a little buried. Luckily they almost never rust. You'll want a flare tool and a couple of different types of tubing benders for whatever you do if you plan on such an ambitious project.
I've not replaced everything, but the front and rear lines aren't too bad. All the rubber stuff is still available.
And save yourself some trouble in the future, and when you put them back together, get some 'anti-seize'. be careful with it, and only get a bit on the actual threads, and not anywhere else.
I got mine lines loose from the rear wheel cylinders and got them back on without damaging them, but as Jurjen said, you'll save yourself alot of headaches if you really soak them first with penetrating oil.
The new wheel cylinders here in Canada were like $11 or $12 dollars each.