If you want to change the complete brake line. You're going to be hard pressed locating a preformed line... You're going to have to purchase the proper brake line diameter a tub bender a flaring tool & maybe even extra connectors..
I just wanted to add to boghog's post with a little cautionary tail. I have a mid to low end flaring tools that is very hard to use. The vise doesn't always hold the brake line square and it does take practice. If the flare is not centered and even, the connection will leak, so pay close attention to the quality of the flare. Maybe use a pre-made connection as a guide.A couple more things to keep in mind.Make sure you get the correct diameter line.Some are metric.Also make sure you get the correct fittings on the line.Match thread against thread.You can probably rent a flaring tool from a parts store.Practice doing double flares on a piece of the old line till your comfortable with your work.And get soft wall tubing,it bends much easier than regular steel tubing.