A properly formed brake line flare creates the sealing surface where the tubing meets the seat inside a brake line fitting. The tube nut supplies the clamping force that holds those surfaces together. If the flare is uneven, cracked, or made to the wrong shape, brake fluid can escape when hydraulic pressures rise.
4Lifetime flaring tools help professional mechanics and capable DIY vehicle owners produce accurate brake line flares for fabrication and repair work. The collection includes portable manual designs, mounted shop tools, and hydraulic options for technicians who flare brake lines regularly.
Choosing the right brake line flaring tool
Match the tool to the flare your vehicle needs. Most domestic and Asian vehicles use a 45° SAE double flare, while most European vehicles use an ISO/DIN bubble flare — see our guide to bubble vs. double flares to identify yours before you buy. Handheld bar-style tools are the most affordable and work well for occasional repairs; bench-mounted and hydraulic flaring tools produce more consistent results and are worth it for shops or for flaring stainless-steel line. Copper-nickel line is the most forgiving material to flare cleanly by hand. New to flaring? Follow our step-by-step brake line flaring guide, and if you're matching tube nuts and unions, see brake line fittings explained.
Replacing a full run instead of repairing one section? Shop our complete brake line kits — coil, fittings, and a lifetime warranty in one box.
