[WB54]

just use a 45 degree flare, if it's copper or cunnifer it's soft enough crush up to the fitting with the tube nut. Use a pipe cutter to trim to length, de-burr the end with a large drill bit, fit your nut and then double lfare the end. Steve Lang did some for me a while back like this, came out nice and works perfect.

 

[WB54]

I'm told a double is required as single flare thins the material. Over time it splits at the edges of the flare. I had a couple split that I replaced. didn't affect the braking but obviously something you want to avoid