Mercedes W447 Rear Right O/S Suspension Leg Wheel Hub Brake Disc Caliper

Visual condition of the part 

The product shows signs of use visible in the photos. 

Mercedes W447 Rear Right O/S Suspension Leg Wheel Hub Brake Disc Caliper is a precision chassis component designed for the rear right side of Mercedes vehicles. It is responsible for stable wheel guidance, correct suspension geometry, and safe load transfer to the vehicle body. This used component from the Suspension replacement kits category allows for a technically sound repair without the need for an expensive replacement of the entire suspension module.

Specifications and technical data

• SKU: A4473505400
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A4473505400
• Substitutable numbers: A4473505400, A 447 350 54 00, A4474208100, A 447 420 81 00, A4474230412, A 447 423 04 12, BG
• Weight: 150
• Location on the vehicle: Rear, Right
• Category: Suspension Component Replacement Kits

Function and role of the rear right steering knuckle

The rear right steering knuckle in the Mercedes W447 is a key load-bearing element to which suspension and chassis components are attached. It ensures:

• stable seating of the wheel hub and bearing components,
• maintenance of the specified rear axle suspension geometry,
• transfer of longitudinal and lateral forces between the wheel and the body,
• cooperation with control arms and other suspension system elements.

Thanks to its specific design, the steering knuckle supports reliable vehicle handling, limits unwanted changes in wheel toe and camber, and contributes to predictable vehicle behavior during braking and acceleration.

Purpose and vehicle fitment

The presented steering knuckle has been designed specifically for the rear right side of the body in W447 series models, which guarantees proper fitment to factory mounting points. The placement on the vehicle (rear – right side) eliminates the risk of error when selecting parts and facilitates service planning.

The element belongs to the Suspension replacement kits group, making it suitable for both individual repairs and broader chassis upgrades involving the replacement of several components on the rear axle.

Performance parameters and assembly aspects

The steering knuckle has been designed to withstand significant operational loads resulting from the vehicle's weight and dynamic forces acting on the wheel. The specific weight of the component translates into appropriate rigidity and resistance to deformation, which is essential for maintaining suspension geometry over a long period of use.

During assembly, it is recommended to:

• check the condition of cooperating suspension elements (control arms, bushings, mounts),
• use new fasteners in accordance with the vehicle manufacturer's recommendations,
• perform a rear axle wheel alignment after the work is completed.

This approach allows for fully utilizing the repair potential of the steering knuckle and restoring the vehicle's correct driving characteristics.

Benefits of using an original Mercedes steering knuckle

Using a steering knuckle dedicated to the Mercedes W447 ensures:

• compliance with the factory suspension design,
• correct positioning of control arm and shock absorber mounting points,
• maintenance of the handling characteristics intended by the manufacturer.

As a result, the driver receives predictable vehicle behavior, and the service center gains the ability to perform repairs in accordance with technical documentation. The used element allows for reducing repair costs while maintaining factory chassis geometry.

If you are planning a comprehensive repair or upgrade of the rear axle suspension area in your Mercedes and need other elements from the same group, such as control arms, mounts, or additional load-bearing components, check the available parts in the Mercedes suspension replacement kits category.

Technical support and knowledge about the suspension system

For users who want to better understand the relationships between the steering knuckle, shock absorbers, control arms, and stabilizers, as well as the impact of these elements on driving safety, we recommend the guide article Suspension system – a comprehensive guide to shock absorbers, control arms, and stabilizers. It allows for consciously planning the scope of service work and selecting appropriate components for a specific vehicle model.