I replaced a split brake line on a 1994 Camry over the weekend. Looking at the set makes me glad to see that my stainless, (non-loosening for over 4 years now), brake lines are not necessarily just for a cosmetic effect.
This makes me want to replace any original brake lines after they are about 10 to 12 years old, maybe 15 at the most. I would have replaced all four on this car, but it is not to be around much longer and Toyota wants $72.00 each for that little rubber hose.
It would have been an easy repair, but the gorilla that worked on the brakes last time put a huge amount of torque on the bleeder valves, so they snapped off and laughed at all efforts to remove them with a screw extractor.
One more reason I like to do this sort of thing myself.
This happened at a shop that I would have previously recommended, but apparently they let the "new guy" finish off the bleeding part of the brake repair that day.
Pat