Left Hydraulic Brake Master Caliper Rear Hand Disc Brake Assembly For Bikes ATV Quad 110Cc 125Cc 140Cc Hydraulic System This rear hand disc brake assembly includes a left-side hydraulic brake master caliper designed for use with bikes, ATVs, and quad vehicles with 110cc, 125cc, and 140cc engines.The unit is built to integrate into existing hydraulic brake systems, providing braking function through a connected master cylinder and brake line setup.It features a construction suitable for off-road and recreational vehicle applications.The assembly mounts on the left side and operates via a hand lever, delivering consistent pressure to the caliper for effective stopping power.Compatible with standard disc brake rotors and hydraulic fluid systems commonly found in small engine vehicles.