I have to replace a rusty piece of brake line but I am saving some of the steel line that isnt rusty but I have to cut that piece out while its attached to the car. How do I do that?
as well as a mini cutter you will have to flare the ends. A bit dicey mucking about with brake lines if you are unsure about the job.
Go to an auto salvage yard get a COMPLETE brake line instead of taking a chance of repairing your old one. The life you save might be mine! This is NOT just a simple cutting flaring job. It is on the line that helps stop your car! It HAS to be a double flare. Just think what would happen if you get in an accident a lawyer found out that YOU repaired your own brake line while not knowing all the process (after all you did ask the question here on a public forum). Hard to believe I got 3 thumbs down while trying to help you save lives. What is wrong with those people?
Mini tubing cutter. Also keep in mind brake system lines must be double flared, not just a std single flare. Your $10 hardware store laring kit will not do a double flare. You make a std. single flare on line, then drop adapter in, and flare it again. The adapter folds the flare over on its self making a leak proof double flare.