Audi A4 B9 Rear Suspension Trailing Control Arm Right O/S 8W0501530D

Audi A4 B9 Rear Suspension Trailing Control Arm Right O/S is a component from the Control arms and ball joints group, designed for operation in the rear right section of the suspension. Engineered for Audi vehicles, it ensures precise wheel guidance, body stability, and predictable vehicle handling. This is an ideal solution for users looking to restore correct suspension geometry and maintain safe driving characteristics.

Specifications and technical data

• SKU: 8W0501530D
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0501530D
• Substitutable numbers: 8W0501530D, 8W0 501 530 D
• Location on the vehicle: Rear, Right
• Category: Control Arms, Ball Joints & Assemblies

Purpose and function in the suspension system

The rear right axle control arm in the Audi A4 B9 is responsible for maintaining the correct position of the wheel relative to the body and for transferring loads generated during acceleration, braking, and cornering. Thanks to its rigid yet appropriately flexible construction, it works in tandem with other suspension components, limiting unwanted wheel movement and supporting the maintenance of proper toe and camber angles.

A correctly selected and functional control arm translates into:

• stable vehicle handling at higher speeds,
• even tire wear,
• precise steering response,
• reduction of vibrations and noise coming from the rear axle.

Technical characteristics and fitment

The offered component has been designed specifically for operation on the rear right side of the vehicle, which guarantees proper geometry and compatibility with the factory Audi suspension system. The control arm's construction is adapted to work with stock ball joints, bushings, and other rear axle components, facilitating installation and subsequent maintenance.

By utilizing the original mounting geometry, the control arm allows for the retention of factory wheel alignment parameters after adjustment at a diagnostic station. This is particularly important for premium-class vehicles, where steering precision and ride comfort are crucial for daily operation.

Condition, origin, and benefits of choosing a used part

The presented control arm is an aftermarket part, sourced from the dismantling of an Audi vehicle. Choosing a used component from this group allows for maintaining the high manufacturing quality characteristic of the manufacturer while reducing repair costs compared to purchasing a new element. This solution is frequently chosen by workshops specializing in the service of high-end cars, where both durability and service economy are valued.

A control arm of this type is particularly suitable in situations where it is necessary to replace a single suspension element after a collision, mechanical damage, or when excessive play is detected during a technical inspection. Maintaining the original design helps preserve the integrity of the entire running gear.

Importance for safety and driving comfort

A functional rear axle control arm has a direct impact on driving safety – it is responsible for the stability of the vehicle's path, especially during sudden maneuvers and braking. In combination with properly functioning shock absorbers, springs, and ball joints, this element limits body roll and improves tire grip on the road surface.

Replacing a worn control arm with a properly selected component helps reduce knocking and play in the suspension, which translates into a more comfortable and predictable ride. For Audi A4 B9 users, this is an important step toward maintaining the balance between comfort and handling precision characteristic of this generation.

Related suspension components and further system upgrades

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 additional control arms, ball joints, or mounting hardware, check out the available parts in the Audi control arms and ball joints category.

To better understand the relationships between control arms, shock absorbers, and stabilizers, and to consciously plan service work on your car, it is worth consulting our guide – you will find practical tips in the article Suspension system – a comprehensive guide to shock absorbers, control arms, and stabilizers.

If you are interested in the broader context of using pre-owned components in premium segment cars and want to optimize service costs without sacrificing quality, you will find helpful information in the market analysis available in the text Crisis in the new parts market? Why used original parts for premium cars are the hottest trend in 2026.