Audi A4 B9 2.0 Suspension Leg Rear Left N/S Wheel Carrier Brake Disc Caliper

Audi A4 B9 2.0 Suspension Leg Rear Left N/S Wheel Carrier Brake Disc Caliper is a complete, used set of rear suspension and brake system components designed for the rear left side of the vehicle. The set comes from the original Audi line, which ensures factory-fit compatibility with the vehicle's construction and proper integration with other components. This is a practical service solution for users who want to restore correct suspension geometry and brake efficiency in their A4 B9 2.0 while maintaining cost-effective repair options.

Specifications and technical data

• SKU: 8W0505431S
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0505431S
• Substitutable numbers: 8W0505431S, 8W0 505 431 S, 8W0 615 403, 8W0 615 601 C
• Location on the vehicle: Rear, Left
• Category: Suspension Component Replacement Kits

Purpose and function of the set

The presented set belongs to the Suspension replacement kits group and includes key components of the rear left suspension corner and brake system. The suspension leg, along with the wheel carrier, is responsible for wheel guidance, transferring loads from the body to the road, and maintaining proper geometry, while the brake disc and caliper ensure effective deceleration and stability during braking.

The placement on the vehicle is rear – left side, which is crucial when selecting parts for post-accident repairs, replacement after wear, or restoring the vehicle's original driving parameters. Using a complete set minimizes the risk of incompatibility between individual components and facilitates the assembly process.

Benefits of using an original Audi set

Original Audi components ensure the preservation of factory handling characteristics, vibration damping, and braking efficiency. In the case of suspension and brakes, this has a direct impact on:

• driving stability at higher speeds,
• even tire wear,
• precision of safety systems (ABS, ESP),
• repeatability and predictability of the car's behavior in corners and during braking.

Choosing a complete set instead of individual elements reduces the need for additional part matching and facilitates workshop work, which translates into more efficient service.

Component characteristics and assembly

The set includes a suspension leg with a wheel carrier and a brake assembly in the form of a disc and caliper, prepared for installation on the rear left side of the vehicle. This configuration allows for the simultaneous replacement of elements responsible for wheel guidance and braking, which is particularly beneficial for repairs following mechanical damage or corrosion.

The placement defined as Rear - left facilitates clear identification of the part by the mechanic and reduces the risk of errors when ordering. The set is intended for installation in the Audi A4 B9 generation model with a 2.0 engine, ensuring dimensional and structural compatibility with the factory suspension of this model.

Condition and use in repairs

The item comes from the secondary market and has a status of Used, which allows for a significant reduction in repair costs compared to new components, while maintaining the manufacturer's original specifications. This type of solution is particularly beneficial for:

• post-accident repairs of the rear axle,
• mechanical damage to the wheel carrier or suspension leg,
• the need to replace a set of elements after a strong impact to the wheel,
• economical car restoration while maintaining OEM parts.

Thanks to the use of original Audi components, it is possible to maintain the technical consistency of the vehicle, which is important for both safety and the subsequent resale value of the car.

Part selection and additional resources

For clear identification of the product in the store system, you can use the SKU designation and the dedicated OEM part number. The set also has interchangeable numbers, which facilitates matching in case of differences between equipment versions or model years within the same generation.

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

For those considering a wider range of work on their car, we also recommend an article describing how to effectively use secondary market components in cars of this brand – more information can be found in the material Audi on second-hand parts – tuning and repairs without loss of quality, which will help you consciously plan both repairs and potential modifications.