Audi A4 B8 Rear Wishbone Lower Control Arm Axle Suspension Right O/S 8K0505312J

Audi A4 B8 Rear Wishbone Lower Control Arm Axle Suspension Right O/S is an original component from the Control arms and ball joints group, designed for the rear right suspension section in Audi models. This used OEM component ensures proper axle geometry, stable handling, and predictable vehicle behavior during braking and cornering.

Specifications and technical data

• SKU: 8K0505312J
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0505312J
• Substitutable numbers: 8K0505312J, 8K0 505 312 J
• Location on the vehicle: Rear, Right
• Category: Control Arms, Ball Joints & Assemblies

Purpose and function in the suspension system

The presented control arm operates in the rear right part of the suspension, responsible for precise wheel guidance relative to the body. Its task is to maintain the specified wheel alignment and camber, which translates into:

• driving stability at higher speeds,
• even tire wear,
• confident vehicle behavior during dynamic maneuvers,
• reduction of unwanted vibrations transmitted to the body.

Thanks to its proper rigidity and geometry, the rear right wheel control arm supports the operation of shock absorbers and springs, creating a cohesive, predictable suspension system.

Benefits of using an original Audi control arm

Choosing an original control arm from the Audi OE group primarily ensures the preservation of factory vehicle handling parameters. The design and mounting points are consistent with the manufacturer's specifications, which facilitates installation and helps avoid geometry adjustment issues after replacement.

• Factory fitment – compatibility with the Audi A4 B8 and A5 8T suspension design without the need for modifications.
• Cohesive operation with other rear suspension components, including other control arms and ball joints.
• Reduction of play and knocking in the rear axle after proper installation and geometry alignment.

By using a component from the same family, you maintain the handling characteristics intended by the manufacturer, which is important for both comfort and driving safety.

Installation and operational characteristics

The control arm is intended for installation in the rear right part of the vehicle, replacing the factory element. During replacement, it is recommended to:

• check the condition of other control arms and ball joints in the rear axle,
• use appropriate tightening torques in accordance with Audi service documentation,
• perform a suspension geometry measurement and adjustment after completing the work.

This approach allows you to fully utilize the potential of the newly installed component and restore predictable, safe vehicle handling.

Technical support and suspension knowledge

If you want to better understand how a complete suspension system works and what role control arms, shock absorbers, and stabilizers play in it, use the advice provided in the article Suspension system – a comprehensive guide to shock absorbers, control arms, and stabilizers. It is a practical source of knowledge that will help you consciously plan repairs and diagnostics.

When choosing used suspension components, it is also worth knowing the typical pitfalls associated with the secondary market – the material Buying used car parts • Most common mistakes when choosing tuning parts may be helpful, which suggests how to assess the condition of components and minimize the risk of a poor purchase.

Expanding Audi suspension repairs

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