The RiToEasysports 1910311 Rear Brake Master Cylinder offers a vital upgrade for your Trail Boss 330, 325 Scrambler, 400, and 500 ATV models. This innovative solution, featuring aluminum alloy construction, ensures superior strength and durability. The new castings pistons provide optimal compression, enhancing braking performance and longevity. Moreover, the fluid bypass control ensures a smooth and consistent brake feel, eliminating any unpleasant vibrations or pulsations. With the RiToEasysports 1910311 Rear Brake Master Cylinder, your ATV will provide a secure and confident ride, even in challenging terrains.