Flaring Brake pipes

Basically, this is the way to flare a brake line: Begin by using a tubing clamp to cut the line to the length you need. Then, before you make the flare, place the brake line fitting (which will eventually connect the line to other parts of the braking system) over the tube. Place the tubing in a clamp to hold it steady. Next, take the flaring tool and insert it into the end of the tube you want flared. The flaring tool looks a little bit like a pitchfork with three prongs. Two prongs attach to the clamp holding the brake line, and the third prong (the one in the middle) actually flares the line. It's mobile; you screw it in and out of the line, which widens it, making the flare.

REF: http://auto.howstuffworks.com/auto-parts/brakes/brake-parts/brake-lines2.htm

      Double and single flare