1995 rrc lwb.

rear brake lines rusted and pinhole leaks.

solution:
my truck is not overly rusted but the steel brake lines get rusty and they will eventually need to be replaced. the main problem is many times the fittings on these lines for the caliper and the 4 way junction on top of rear diff are corroded as well. that leaves you with a problem as any spanner placed on these will not be the original size and you will strip them i dont care if you soak them in pb blaster or use a flare...you will end up with a mess.

my advice:
you have to junk the lines, so cut them flush to the fitting first. then if your socket wont fit on nut bc its corrroded and maybe shrunk from 10mm to 9 mm or 8mm and malformed do not try to force anything but use a stipped nut remover socket and hammer it on...then if feel you get good purchase on it try to turn it...little propane torch heat wont hurt as well....the main point is dont just put a spanner on it and try to force anything....mine were so corroded that the metal nut was like mashed potatoes.. best advice is look at the nut...if its malformed due to rust start with the stripped nut socket first, not the spanner...it will save you a lot of headaches later. trust me

the fittings can be ordered mine were junked and get some cuni line and bubble flare them...fedhill has the fittings

if you dont follow this advice and use spanner then strip then use vice grips and strip you are left with almost no metal left. only solution? maybe drill so try not to go that route