Genuine OEM Volkswagen Brake Master Cylinder, part number 1K1614019AG. This component converts the force applied to the brake pedal into hydraulic pressure to activate the brakes. It is located at position 1 in the diagram. The part weighs 0.666 kg and has dimensions of 0.22 m x 0.12 m x 0.075 m. Genuine OEM brake master cylinders are precisely engineered to deliver consistent hydraulic pressure, ensuring reliable and responsive braking performance.