I have a blown brake line how do I get the line off to replace it.

Have you ever made your own brake lines before? Double-flare tool? If not , I would suggest a professional , for your own safety.

AGREE WITH ZIPTIE

I had the same leak and found that the line was under recall so I called the Chevy Dealer and they picked up my truck and fixed the line at no cost. They said the cab caused the leak over time. I think that is the same problem you are having let me know OK. Good luck.