This hydraulic brake master cylinder kit is designed for 150cc go-karts, including compatible Hammerhead and Trailmaster models. It includes a master cylinder, three brake calipers, three brake hoses, and brake discs for a ready-to-install braking setup. The assembly is preloaded with DOT3 brake fluid, so there is no need to bleed the brakes before use. Its aluminum and steel construction is built for dependable stopping performance and heat dissipation in demanding riding conditions.