The wire that wraps the brake line is called gravel guard. Like the name implys it protects the tubing from a kicked up rock from the tire that might damage or puncture the brake line. Some brakeline places sell the coiled wire ready to go to slide over your brake tubing if your bending and flairing your own. I believe inline tube sells the gravel guard by itself. Cheap too i think a 20' long roll of it is $25
