Mercedes W639 Rear Window Tailgate Trunk Wiper Arm A6398201344

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W639 Rear Window Tailgate Trunk Wiper Arm is an original tailgate wiper arm designed for installation in the rear area of the vehicle. This component has been specifically engineered for Mercedes W639 series models, ensuring the correct wiper blade operating area, stable system performance, and safe water removal from the trunk window.

Specifications and technical data

• SKU: A6398201344
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6398201344
• Substitutable numbers: A6398201344, A 639 820 13 44
• Location on the vehicle: Rear
• Category: Wiper Arms

Purpose and function in the vehicle

The presented wiper arm is dedicated for installation on the tailgate rear window of the Mercedes W639. It is responsible for transferring motion from the drive mechanism to the wiper blade, maintaining proper pressure against the glass, and ensuring stable operation throughout the full range of motion. Thanks to its tailored geometry and correct setting angle, the arm allows for effective window cleaning under typical operating conditions – during rain, snow, or road debris.

Construction and technical fitment

The wiper arm belongs to the Wiper arms category and has been constructed as a component that works with the factory rear wiper mechanism in the Mercedes W639. The properly shaped mount ensures correct seating on the drive axle, and the arm profile guarantees proper guidance of the blade across the glass surface. The use of original geometry reduces the risk of vibrations, uneven pressure, or incorrect operating paths, which is significant for both visibility and the durability of the entire system.

Condition of the component and practical application

The offered wiper arm is a used part, making it a reasonable choice for maintenance repairs and for restoring the functionality of the wiper system after mechanical damage to the tailgate. It is particularly useful in situations where the existing arm is bent, corroded, has a damaged mount, or no longer provides proper blade pressure against the glass. Replacing the arm allows for the restoration of correct wiper operation without the need to interfere with other system components.

Benefits of using an original arm

Using an original rear wiper arm in the Mercedes W639 ensures:

• proper fitment to the tailgate and drive axle,
• stable blade pressure against the glass throughout the full range of motion,
• proper cooperation with the factory wiper mechanism,
• maintenance of the correct rear window cleaning area.

As a result, the driver gains better rear visibility in difficult weather conditions, and the wiper system operates in a predictable manner consistent with the vehicle manufacturer's specifications.

Related Mercedes Wiper arms and technical knowledge

If you are planning a comprehensive repair or upgrade of the rear window and tailgate area in your Mercedes and need other components from the same group, such as additional arms, compatible mounts, or dedicated blade holders, check the available parts in the Mercedes Wiper arms category.

For broader work related to the bodywork and tailgate, including after collisions or mechanical damage, it is worth checking out practical tips regarding the selection and installation of dismantled parts – you will find them in the article Bodywork and exterior – post-accident repairs using dismantled parts.