Audi S5 8T Front Suspension Lower Control Arm Wishbone Left N/S 8K0407155B

Audi S5 8T Front Suspension Lower Control Arm Wishbone Left N/S is a component from the Control arms and ball joints group, designed for the front suspension on the driver's side. It is responsible for precise wheel guidance, driving stability, and correct geometry, which translates into confident and predictable vehicle handling. Thanks to a design consistent with the solutions used by Audi, the control arm ensures proper cooperation with other chassis components.

Specifications and technical data

• SKU: 8K0407155B
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0407155B
• Substitutable numbers: 8K0407155B, 8K0 407 155 B
• Location on the vehicle: Front, Left
• Category: Control Arms, Ball Joints & Assemblies

Purpose and placement in the suspension

The presented lower control arm operates on the front axle, on the left side of the vehicle. It is a key wheel-guiding element that transfers loads from the body to the hub and helps define the suspension geometry. A correctly selected and functional control arm limits unwanted wheel movement, stabilizes the car during braking, and improves cornering behavior.

Due to its dedicated placement in the chassis system, this component works with the shock absorber, spring, and ball joint, ensuring consistent operation of the entire front suspension. Proper fitment for the Audi S5 8T design allows for maintaining factory handling characteristics.

Technical and functional characteristics

The lower control arm is responsible for maintaining the constant position of the wheel relative to the body in both horizontal and vertical planes. The appropriately selected arm geometry and mounting points enable the maintenance of correct camber and toe angles, which has a direct impact on:

• vehicle stability at higher speeds,
• even tire wear,
• braking efficiency and vehicle behavior during emergency maneuvers,
• ride comfort on uneven surfaces.

An element from this design group is engineered to work under significant dynamic loads, which is why its proper selection is of great importance for operational safety. Using a solution consistent with the vehicle manufacturer's specifications allows for maintaining predictable steering system reactions.

Benefits of using original Audi geometry

The control arm prepared for the Audi S5 8T maintains factory geometry and mounting points, which facilitates installation and subsequent wheel alignment. As a result:

• a mechanic can efficiently perform the replacement without the need to modify other components,
• after setting the wheel alignment, the vehicle regains the driving properties intended by the manufacturer,
• the steering system operates with appropriate precision, without excessive play or delayed reactions.

Using components with a design consistent with Audi solutions reduces the risk of improper fitment, unwanted stresses in the suspension, and accelerated wear of adjacent parts.

Condition of the element and use in service practice

The offered control arm comes from the used parts group, which allows for an economical suspension repair while maintaining a design consistent with the vehicle manufacturer's solutions. This type of component is particularly useful in situations where mechanical damage has occurred (e.g., after hitting a curb or a pothole) and it is necessary to replace the wheel-guiding arm.

After installation, it is recommended to perform a full front axle geometry check to fully utilize the properties of the newly installed control arm and ensure even tire wear as well as stable vehicle handling.

Suspension system expansion and additional information

If you are planning a comprehensive repair or upgrade of the front 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 plan service work and understand the relationships between individual suspension components, it is worth checking out the guide describing the role of shock absorbers, control arms, and stabilizers in modern designs – a detailed discussion can be found in the article Suspension system – a comprehensive guide to shock absorbers, control arms, and stabilizers.