Genuine OEM Audi Electromagnetic Brake Servo Unit, part number 5WC614105BA. This unit amplifies braking force, providing the necessary assistance to the master cylinder for effective deceleration. It is mounted between the brake pedal and the master cylinder. Weighing 5.32 kg, this component is critical for safe and responsive braking. Genuine OEM brake servos are manufactured to exact specifications to ensure consistent performance and longevity.