Correct me if I'm wrong here Chromie but all flairs on brake lines are a double flair. Your average flairing tool is not going to do the job. This I learnt the hard way.
In the end I purchased the pipe from B & R Brakes, bent it all up to shape and took it to Pirtek where they put the double flairs on it for me. The tool that did it I was told cost a couple of grand. I watched him do it and the tool was way different to my standard flairing tool, I have had no poblrems.
Hope this helps.
Cam