Considering the nature of brake lines and how they rot, its always recommended to replace the entire line. If you accidently touch a different line, its guaranteed to leak also. Thats plumbers murphys law.
If you replace the brake line with pre flared lines, and are not a master bender of steel pipe, conside replacing with nickel copper lines sold at Autozone. Much easier to bend than steel pipe. And a much better quality material when it comes to corrossion. Many of the European manufactures use a copper nickel pipe over steel pipe.
How long is the entire line and is there a way to determine which actual brake line I need to purchase. I have a mechanic that will be working on it, I just want to do my research to figure out what i'm looking at financially as far as parts.
if hes just spooling off a coil of line and the fittings are cheap but the labor on lines is high because its a pain in the butt. i did all mine including the price of the metric flare tool was a little over 100. i think thats the one thats about 4 to 5ft goes to the pass side rear wheel, maybe 20