So my front-driver's side hard brake line decided to blow up (right where it goes through the frame). Luckily I avoided a collision or two. /forums/images/graemlins/thumb.gif That spot looks like it's particularly susceptable to corrosion. So my question is: Can I get away with just replacing the proportioning valve-to-caliper section, or should I run all new lines (from master cylinder on out)? The rest of the lines aren't new but they look OK. Of course, the spot that busted looked OK too. /forums/images/graemlins/rolleyes.gif Safety is top priority, but I don't feel like running all new line if it's not needed. Any good ways of inspecting them aside from the "Yup, looks good" method? Bonus question: What's the purpose of the spirals in the line at the MC?