Audi A4 B9 A5 F5 Rear Lower Control Arm Wishbone Left Right N/S 8W0505311E

The Audi A4 B9 / A5 F5 Rear Lower Control Arm is an original rear axle suspension component, designed for installation on either the left or right side. Thanks to its factory geometry and robust construction, it ensures stable vehicle handling, precise alignment maintenance, and predictable cornering behavior. This is a practical solution for users who want to restore proper suspension function while adhering to the manufacturer's original specifications.

Specifications and technical data

• SKU: 8W0505311E
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0505311E
• Substitutable numbers: 8W0505311E, 8W0 505 311 E, 8W0505311H, 8W0 505 311 H
• Location on the vehicle: Rear, Right, Left
• Category: Control Arms, Ball Joints & Assemblies

Purpose and Function in the Suspension System

The presented rear lower control arm operates within a multi-link suspension system, responsible for maintaining the correct wheel position relative to the body and controlling suspension angles during driving and braking. Its placement on the vehicle is on the rear axle, with the possibility of installation on both the right and left sides, which simplifies part selection for repairs of paired components.

This control arm belongs to the group of Control Arms and Ball Joints, which are key components for steering rigidity, comfort in absorbing bumps, and even tire wear. A correctly selected and functional part from this group reduces unwanted play, improves steering response, and supports the operation of safety systems such as ABS or ESP.

Compatibility and Identification Parameters

The offered control arm is an original component from the Audi brand, meaning it is a perfect fit for the factory suspension design in A4 B9 generation and A5 F5 generation models. The part has a dedicated OEM number and associated replacement numbers, allowing for precise verification in manufacturer catalogs or when comparing with a removed part from the vehicle.

The presence of reference numbers also facilitates selection in cases of previous suspension upgrades or variations due to body styles. For the user, this means greater certainty that the ordered control arm will work correctly with other system components, without the need for modifications or adjustments.

Performance Characteristics and Benefits of Use

As a used part, the control arm offers a sensible compromise between repair cost and maintaining original manufacturer specifications. Compared to low-cost aftermarket alternatives, the original design ensures predictable behavior under load, appropriate rigidity, and proper interaction with other components of the multi-link suspension.

The use of this type of control arm is particularly advisable when the vehicle exhibits symptoms such as:

• uneven tire wear on the rear axle,
• clunks or play felt when driving over bumps,
• problems with rear wheel alignment,
• reduced stability at higher speeds.

Replacing a worn control arm with a functional part from the same construction group allows for the restoration of correct suspension geometry, leading to better traction, more confident handling, and more predictable vehicle behavior in emergency situations.

Professional Installation and Service Recommendations

To fully utilize the potential of the offered control arm, installation in a specialized service center is recommended, using appropriate tools and following manufacturer procedures. After replacing the component, it is advisable to perform a rear axle alignment to correct wheel camber and toe angles and confirm the correct seating of the control arm in the system.

In service practice, it is often recommended to simultaneously inspect other components from the Control Arms and Ball Joints group to avoid situations where a new or functional component works with other, already worn parts. This approach increases the durability of the repair and reduces the risk of needing further suspension intervention in a short period.

Suspension System Expansion and Educational Materials

If you are planning a comprehensive repair or upgrade of the suspension area in your Audi and need other parts from the same group, such as additional control arms, ball joints, or mounting elements, check the available parts in the Audi Control Arms and Ball Joints category.

For users who want to better understand the relationships between individual suspension components and their impact on driving safety, a guide describing shock absorbers, control arms, and stabilizers in various models will be useful. A detailed discussion of these issues can be found in the article "Suspension System – A Comprehensive Guide to Shock Absorbers, Control Arms, and Stabilizers", which helps in consciously planning repairs and upgrades for premium vehicles.