Genuine OEM Audi Rear Pre-Charging Pump, part number 02D525557. This pump is a crucial component for priming the hydraulic system, ensuring efficient power transfer within the drivetrain. It is typically located in the rear of the vehicle. Constructed with a durable metal body and featuring an electrical connector and hose connection, it weighs approximately 0.55 kg. Choosing a genuine OEM pre-charging pump ensures correct hydraulic pressure, reliable operation, and proper integration with the vehicle's control systems.