How to cone brake lines?

To cone brake lines, first, ensure the brake line is clean and free from debris. Use a tube coning tool or a specialized brake line flaring tool to create a conical shape at the end of the brake line, which helps ensure a proper seal when connecting to fittings. Carefully follow the manufacturer's instructions for the tool to achieve the correct angle and depth. Finally, check for any burrs or sharp edges and remove them to prevent leaks.