Hydraulic Rear Brake Master Cylinder Assembly For 110cc & 125cc Dirt Bikes Go kart This hydraulic rear brake master cylinder assembly is designed for use with 110cc and 125cc dirt bikes and go karts.It features a construction suitable for off-road and recreational vehicle applications.The unit includes all necessary components for installation and connects directly to the existing brake line system.It is engineered to provide consistent brake pressure and performance under normal operating conditions.Compatible with standard hydraulic brake setups, this master cylinder fits common mounting configurations found on small displacement motorcycles and vehicles.