Brake Line

Brake line by the coil, in the two materials worth building a car out of. Cunifer copper-nickel resists corrosion far better than plated steel and bends and double-flares by hand, which is why most underbody replacements and full custom line jobs get built from it. It comes as a 25 foot coil in your choice of 3/16″ or 1/4″. Stainless steel brake tube is the harder-wearing option where appearance matters and you have a flaring tool rated for it. Also here: remote reservoir hose in 5ft lengths, for running fluid from a master cylinder to a reservoir mounted somewhere else. Check the outside diameter your calipers and master cylinder are plumbed for before choosing a size.