A bead breaker is a tool that separates the tire bead—the inner edge of a tire—from the wheel rim, a necessary step for tire removal and repair. It works by applying force to break the seal between the tire and rim, which is often held together by air pressure, corrosion, or the bead being stuck. They come in manual and powered (pneumatic or hydraulic) versions and are essential for safely and efficiently servicing tires without causing damage to the wheel or tire.