Mercedes W177 W247 Wiper Arm Rear Window Wiper Trim Mounting A2478206100

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W177 W247 Wiper Arm Rear Window Wiper Trim Mounting is an original component from the Wiper arms category, designed for the rear window of Mercedes vehicles. It ensures stable wiper blade operation, which translates into a clear field of vision and safe vehicle operation in difficult weather conditions.

Specifications and technical data

• SKU: A2478206100
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2478206100
• Substitutable numbers: A2478206100, A 247 820 61 00
• Location on the vehicle: Rear
• Category: Wiper Arms

Purpose and function of the rear wiper arm

The presented arm is a component mounted in the rear window area, responsible for precisely pressing the wiper blade against the glass surface. A properly selected arm minimizes vibrations, reduces noise during wiper operation, and helps maintain even pressure along the entire length of the blade, which is particularly important during heavy rain or snow.

In Mercedes W177 and W247 series vehicles, a properly functioning rear wiper arm improves maneuvering comfort, especially when reversing and parking, when visibility through the rear window is crucial for safety.

Construction and fitment for Mercedes vehicles

The arm has been designed specifically for the body structure and wiper mechanism of Mercedes W177 and W247 family models. The appropriate mounting geometry and operating angle ensure proper blade guidance along the curve of the glass, without placing excessive load on the wiper axis and the drive motor.

The original Mercedes origin means maintaining factory standards of quality, compatibility, and fitment with other wiper system components. As a result, installation is predictable, without the need for modifying mounts or interfering with the tailgate structure.

Performance characteristics and installation benefits

The rear wiper arm in this version provides:

• stable blade guidance across the glass surface throughout the full range of the mechanism's operation,
• reduction of skipping and streaking, when paired with a properly selected blade,
• a consistent exterior appearance in line with the styling of the Mercedes W177/W247 body,
• secure seating on the wiper axis, which reduces the risk of play and unwanted vibrations.

This component is particularly important in vehicles used year-round, where the rear window is exposed to road dirt, salt, and moisture. A functional arm, working with the correct blade, makes it easier to keep the window clean and improves daily driving comfort.

Product condition and service application

The offered wiper arm comes from the used parts segment, which allows for an economical replacement of a damaged or worn component while maintaining the manufacturer's original specifications. This is a practical solution in situations where the existing arm has become bent, corroded, cracked near the mounting point, or no longer provides proper blade pressure against the glass.

Replacing the arm is a typical service operation, most often performed in cases of:

• mechanical damage to the arm (e.g., during snow removal or car washing),
• excessive play at the mounting point,
• uneven blade pressure against the glass, despite using a new blade.

Expanding the Mercedes wiper system

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

More on improving vehicle comfort

If you are considering a broader upgrade of your car in terms of convenience and ergonomics, it is worth checking out our guide on the impact of interior equipment on perceived driving comfort – you will find practical tips in the article Interior metamorphosis: how branded seats from dismantling improve comfort and vehicle value.