I have an old-school brake line flaring tool that I've reluctantly used what seems like 1,001 times to flare 3/16 steel brake line. It's the inexpensive one available at the parts store with the wing ...

Brake line wrenches (often called flare nut wrenches or simply line wrenches) serve a specific purpose in a mechanic’s toolbox. Several styles exist, but determining which brake line wrench is right ...