I used 1/4 in. brake line to make lines for my speedster. The original type fittings that I got from Bratton's slipped right on and sealed up nicely at the carburetor. On a related note, I am having trouble sealing one of the flare type fittings that are part of the brake line. I know it's the flare that makes the seal so I haven't used any sealer. Does anyone have any ideas. Thanks. Howie