Genuine OEM Volkswagen Electromechanical Brake Servo, part number 4M0614105AA. This electrically powered unit assists in applying braking force. It is located as part 1 in the brake system diagram. This advanced servo system enhances braking performance and driver comfort by providing consistent and responsive assistance. Genuine OEM electromechanical servos are designed with specific control algorithms and power delivery for optimal integration with the vehicle's braking system.