Audi A4 B9 Wheel Carrier Rear Left N/S Wheel Hub Holder Brake Disc Trim Plate

Audi A4 B9 Wheel Carrier Rear Left N/S Wheel Hub Holder Brake Disc Trim Plate is a factory-original chassis component designed for the rear left side of the vehicle. It is responsible for precise wheel guidance, transferring suspension loads, and providing a stable hub mount, which directly impacts safety, wheel alignment, and predictable vehicle handling on the road. Using a pre-owned component from the original Audi production line allows for an economical yet technically sound suspension repair.

Specifications and technical data

• SKU: 8W0505431S-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0505431S
• Substitutable numbers: 8W0505431S, 8W0 505 431 S
• Location on the vehicle: Rear, Left
• Category: Suspension Component Replacement Kits

Function and role in the rear axle suspension

The wheel carrier with hub and rear suspension support in the Audi A4 B9 serves as a critical node connecting the springing, damping, and wheel mounting systems. The rear axle geometry relies on this component, which is why selecting the correct side of the vehicle is essential for:

• maintaining proper wheel camber and toe angles,
• vehicle stability during braking and acceleration,
• even tire wear,
• correct operation of safety systems (ESP, ABS – depending on vehicle design).

Thanks to its dedicated placement on the rear left side of the vehicle, the component is structurally matched to the Audi's body architecture and suspension system, which promotes confident handling and predictable car response in daily use.

Benefits of using an original Audi component

Using an original wheel carrier with hub and support in the Audi A4 B9 allows you to maintain factory suspension performance parameters. In practice, this means:

• precise fitment to control arm and shock absorber mounting points,
• compliance with factory dimensional tolerances,
• no need for modifications or adaptations during installation,
• easier wheel alignment adjustment after component replacement.

A pre-owned component of this class is a sensible choice for accident repairs or routine maintenance when you want to combine controlled costs with the preservation of the manufacturer's intended design.

Practical service application

The rear left wheel carrier with hub and suspension support is particularly useful in situations where mechanical damage to the rear axle has occurred – e.g., after hitting a curb, a collision, or long-term driving with damaged suspension components. Replacing this sub-assembly is important when the following issues arise:

• problems with rear axle alignment,
• uneven tire wear on one side,
• noticeable play in the wheel mounting,
• deformations or cracks in the suspension mounting areas.

After installation, it is recommended to perform a professional wheel alignment to fully utilize the potential of the newly installed component and restore stable, predictable handling of the Audi A4 B9.

Part selection and compatibility

When selecting a wheel carrier with hub and suspension support for the Audi A4 B9, it is crucial to pay attention to the mounting side and the rear axle of the vehicle. The product should be treated as an item from the Suspension Replacement Kits group, which facilitates planning a comprehensive repair – along with other chassis components. Proper matching to the specific model version helps avoid installation issues and ensures correct cooperation with other suspension parts.

If you are planning a comprehensive repair or upgrade of the rear axle suspension area in your Audi and need other elements from the same group, such as control arms, bushings, or springs, check the available parts in the Audi Suspension Replacement Kits category.

Pre-owned components and repair cost optimization

Choosing a pre-owned, original suspension component is a way to reduce service costs while maintaining the design intended by the manufacturer. In many cases, this allows for restoring full functionality of the chassis without the need to invest in more expensive new parts. If you are interested in the broader context of using premium pre-owned sub-assemblies and want to better understand how they affect repair budgets, it is worth reading the article Used parts for Mercedes - original parts from dismantling, which discusses a practical approach to such service solutions.