Audi A4 B9 Front Wheel Carrier Wheel Hub Brake Disc Plate Left N/S 8W0407253F

Audi A4 B9 Front Wheel Carrier Wheel Hub Brake Disc Plate Left N/S is a component from the Suspension replacement kits group, designed for operation on the front left corner of the vehicle. The component is responsible for precise wheel guidance, driving stability, and the proper interaction between the suspension system and the brakes, which directly impacts safety and the predictable handling of the car.

Specifications and technical data

• SKU: 8W0407253F-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0407253F
• Substitutable numbers: 8W0407253F, 8W0 407 253 F
• Location on the vehicle: Front, Left
• Category: Suspension Component Replacement Kits

Purpose and function in the suspension system

The steering knuckle with brake disc on the front left side is a key node connecting the suspension, steering, and braking system components. It is responsible for:

• maintaining the correct geometry of the front axle,
• stable mounting of the wheel hub and wheel,
• correct positioning of the brake disc relative to the brake caliper,
• transferring loads from the road surface to the suspension and body.

Thanks to this, the steering system maintains appropriate precision, and braking force is evenly distributed to the left side of the front axle, which improves vehicle control in daily operation.

Compatibility and fitment for Audi

The offered element has been designed specifically for Audi vehicles, which ensures factory-level fitment to the body and suspension structure. The use of original mounting geometry allows for:

• maintaining the suspension angles specified by the manufacturer,
• compatibility with stock control arms, shock absorbers, and steering system components,
• correct seating of the brake disc in the existing braking system.

Such fitment reduces the need for additional modifications and facilitates installation in a professional service center or specialized workshop.

Performance characteristics and installation benefits

The steering knuckle with brake disc on the left side of the front axle affects several key areas of vehicle operation:

• Driving stability – proper wheel positioning reduces vehicle pulling and improves the predictability of reactions to steering input.
• Braking efficiency – a correctly set disc relative to the caliper promotes even brake pad wear and stable braking force.
• Driving comfort – correct suspension geometry reduces vibrations transmitted to the body and steering wheel.
• Structural safety – a properly selected load-bearing element minimizes the risk of play and uncontrolled movement within the front suspension.

Choosing this component is particularly beneficial for post-collision repairs, replacing a damaged steering knuckle, or during a comprehensive front suspension overhaul when you want to maintain factory driving parameters.

Condition, origin, and technical aspects

The offered element comes from the group of used parts, which allows for combining cost-effective repair with maintaining the original design intended for the given model. In practice, this means:

• maintaining stock geometry and mounting points,
• the ability to utilize existing suspension and brake solutions,
• easier diagnostics and future service due to compliance with Audi technical documentation.

Before installation, it is recommended to perform a standard inspection of the element in a workshop (including checking surfaces that interface with the bearing, control arms, and caliper), followed by a front axle geometry alignment after the replacement is complete.

Suspension system expansion and additional materials

If you are planning a comprehensive repair or upgrade of the front axle suspension zone in your Audi and need other elements from the same group, such as additional steering knuckles, complete mounting modules, or related load-bearing components, check the available parts in the Audi suspension replacement kits category.

For a broader perspective on the cost-effectiveness of using original dismantled components in the premium segment, it is worth reading the article on our blog: Used parts for Mercedes – original parts from dismantling, which discusses the practical aspects of selecting and operating such components.