ATV compatible with Polaris Sportsman 500-1000 rear disc brake pump with oil cup 1930854~~Installation: When installing, you must loosen the oil drain screw of the pump under the brake, and continuously press the brake foot brake pump to generate pressure, so that the oil of the brake pump passes through the oil pipe, enters the brake pump, discharges the air, and then tightens the oil drain screw. The brake system does not work without exhausting air. Fitment: - Metal material - Stable performance - super durable - simple to install - Long service life - Material: Aluminum & Copper - The rear master cylinder is made of precise alloy piston and anti-ageing seal kit, more braking force and duable.The oil cup is made of durable ABS plastic, heat resistance, cold resistance, impact resistance. The material of oil tubing is thickened rubber. Applicable Models: Rear Brake Master Cylinder Compatible with Polaris Sportsman 700 800 Scrambler 400 500 Magnum 325 330 500 Trail Boss 325 330 Trail Blazer 250 330 400 Xpedition 325 425 Xplorer 250 300 400 1910311 1910791 1930854 Package Included: 1 x Rear Brake Master Cylinder 1 x Rear Brake Fluid Reservoir 1 x Oil Pipes