Audi A8 D3 Control Arm Front Suspension Wishbone Link Upper Left N/S 4E0407505F

Audi A8 D3 Control Arm Front Suspension Wishbone Link Upper Left N/S is an original component from the Control arms and ball joints group, designed for precise wheel guidance on the driver's side. This used OEM part ensures factory suspension geometry, which translates into stable handling, predictable vehicle behavior, and proper interaction with other chassis components. It is a solution for users who want to maintain a construction consistent with the manufacturer's standard without compromising on fitment.

Specifications and technical data

• SKU: 4E0407505F
• Mark: Audi
• Condition: Used
• OEM Part Number: 4E0407505F
• Substitutable numbers: 4E0407505F, 4E0 407 505 F
• Location on the vehicle: Front, Left
• Part type: Control Arm & Ball Joint Assembly
• Category: Control Arms, Ball Joints & Assemblies

Purpose and function in the suspension

The presented control arm operates in the front suspension on the left side, responsible for maintaining the correct position of the steering knuckle and controlling wheel alignment angles. As an upper component, it is part of the multi-link system, which in the Audi A8 D3 was designed for high driving comfort and precise handling at higher speeds.

A properly selected upper control arm helps to limit unwanted changes in toe and camber during braking, acceleration, and driving over bumps, which affects:

• straight-line driving stability during acceleration,
• confident vehicle behavior in corners,
• even tire wear,
• proper operation of safety systems (ABS, ESP).

Benefits of using an original Audi control arm

The original control arm with the Audi logo ensures compliance with the vehicle's factory design specifications. This means proper arm stiffness, appropriately selected ball joint operating characteristics, and compatibility with other front suspension components. In practice, this translates into:

• secure mounting fitment to the attachment points on the body and steering knuckle,
• preservation of the original suspension geometry after wheel alignment,
• consistent cooperation with other control arms and steering system components.

The used OEM part is a good choice for repairs where the priority is to maintain factory handling characteristics without the need to use aftermarket replacements with unknown parameters.

Vehicle placement and installation aspects

The control arm is intended for installation on the front axle on the left side, in the upper part of the suspension system. Correct identification of the installation side is crucial for safety and the proper operation of the ball joint and bushings. Before installation, it is recommended to:

• verify the part's compatibility with the vehicle based on manufacturer markings,
• check the condition of cooperating suspension components (other control arms, links, shock absorbers),
• perform wheel alignment after completing the work to fully utilize the system's properties.

Professional installation and subsequent wheel alignment allow for fully utilizing the advantages of the multi-link construction used in the Audi A8 D3.

Practical application and operation

The upper control arm on the driver's side has a significant impact on driving comfort, especially in luxury class cars such as the Audi A8. Together with other suspension elements, it is responsible for:

• damping vibrations transmitted from the road surface to the body,
• maintaining stable tire contact with the road,
• reducing play in the steering system.

Regular inspection of the condition of control arms and ball joints is recommended, especially in cars operated on roads with poorer surface quality. Replacing a worn component with an original Audi part allows for restoring predictable vehicle behavior and reducing additional stress on other suspension parts.

Related components and further knowledge

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 mounting hardware, check 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 the impact of these components on safety and driving comfort, it is worth checking out our guide: Suspension system – a comprehensive guide to shock absorbers, control arms, and stabilizers.