Motorcycle Dirt Bike Rear Brake Hydraulic Pump Master Cylinder For XT250 Serow XG250 WR250F WR250R WR250X Working Principle of Brake Pump: In a confined space, driven by hydraulic pressure, the principle of Pascal is used.When the brake pedal is stepped on or the brake lever is pinched, the upper pump piston pushes the lower pump piston through the brake fluid, so that the brake pad and the brake disc are tightly attached to each other to brake the wheels.After the brake is released, the brake fluid flows back.The force on the brake pad disappears, the brake pad separates from the brake disc, and the brake is released.The brake oil is pressed out from the oil outlet pipe of the oil pump, and the lower pump piston is pressed through the brake oil pipe to push the brake pads against the brake disc.Item Type: Brake Pump Master Cylinder Material: Metal Item Weight: 250g Color: As shown in actual photos Compatible Models: XT250 Serow (2005-2018) XG250 TRICKER (2005-2017) WR250F (2003-2020) WR250R (2007-2017) WR250X (2007-2012, 2014, 2016-2017) WR450F (2003-2018) YZ125 (2003-2018) Design and : The rear brake hydraulic pump is crafted from metal, longevity and consistent performance.Its lightweight design minimizes impact on the bike's handling, allowing for agile maneuvers.The pump is designed to provide braking for off-road and urban riding conditions.Performance and Compatibility: Engineered to meet demanding conditions, this master cylinder enhances stopping power with engineered metal pistons.It is tailored to fit a range of models and meets ISO9001 certification standards for and performance.Ease of Installation: The direct replacement design straightforward installation without additional tools or modifications.If assistance is needed, support is available to guide you through the process.: If your motorcycle model is not listed, you can inquire for compatibility assistance.