Brand RoadPassion Item Type Brake Pump Master Cylinder Material Type Metal Item Weight 240g Color As shown in product images Working Principle of Brake Pump: In a confined space, driven by hydraulic pressure, the principle of Pascal is used.When the brake lever is pinched, the upper pump piston pushes the lower pump piston through the brake fluid, causing the brake pad and brake disc to make for braking.After release, the brake fluid flows back, the force on the brake pad ceases, and the brake pad separates from the brake disc.Brake fluid is displaced from the oil outlet pipe of the master cylinder and travels through the brake line to actuate the brake caliper pistons. Compatible With Farmhand 450 2017, 325/400 2011–2015, 400 2011–2014, 400 HO 4X4 2011–2014, 450 2016–2020, 500 (except Forest/Touring Edition) 2011–2013, 570 (except 6x6 Edition) 2014–2021, 800 (except 6x6 Edition) 2011–2016, ETX 2015.