Which tool would most likely be used to remove a brake line?

The tool most likely used to remove a brake line is a tubing wrench. This type of wrench is specifically designed to grip and turn tubing fittings, which are commonly found in brake lines. The unique design of a tubing wrench includes a rounded opening that fits over the fitting while providing maximum surface contact, allowing for more torque without damaging the fitting itself. This is particularly important in brake systems, as they require a tight, secure fit to operate safely.

Using a tubing wrench minimizes the risk of stripping the fittings, which can happen with other types of wrenches. For instance, a pipe wrench is designed for larger, round shapes, which may not fit well on the hex shapes of brake line fittings. On the other hand, box-end and open-end wrenches, while they can work in some situations, do not provide the same level of grip and security on the fitting as a tubing wrench does, potentially leading to damage or difficulty in loosening stubborn fittings. Hence, a tubing wrench is the appropriate choice for effectively and safely removing brake lines.