You'd think that the way Minis leak oil they'd never rust on the underside, but they do! If your Mini is rusty below it is a good idea to check your metal brake lines; rust on them could be disasterous.This complete kit is available, in non-corroding copper-nickel, to replace every hard line. They're premade in the proper lengths, with fittings in place. Just bend them to the proper shape and install!