Hello Forum, Working with my son on his 05 Aveo, rear left brake cylinder blew out, drum is fine, everything else was toast. brake fluid destroyed back plate as well, new back plate, shoes, hardware, brake cylinder. Could not remove metal brake line from cylinder or from hose metal female connector without destroying metal brake line. That pre made line is no longer available from Chevi, Made our own out of metal line, double flare tool / looked perfect / double flare looks perfect. Totally leaks from fitting threads - both ends. Any thoughts ? The fittings seem correct, thread in fine, look similar to the old original (hard to tell for sure), brake line tightens right up. Not sure if steel line is the best, or if we have the exact fittings. Chevi is no help, Thanks in advance !