If you are forming new flares on the brake lines, after you install the lines and snug everything up, the joints will all leak after you fill it up with brake fluid. That's because the new flares "deform" a bit to the mating surface of the wheel and master cylinder fittings. If you go around again you'll find them all a bit loose. Tighten them up again and all the leaks should disappear. Not too tight, just enough to stop the leaks. When I first replaced the lines on my BN-2 I was very careful forming the flares and, to say the least, I was quite surprised when everything leaked. But going around again with the proper brake fitting wrench (DO NOT USE ANYTHING ELSE!) fixed the leaks.