Audi A3 8V Front Steering Hub Knuckle Left N/S 5Q0407255Q

The Audi A3 8V Front Hub Knuckle Left Front is a component from the Bearings, Wheel Hubs, and Bushings group, designed for the front suspension on the driver's side. It is responsible for stable wheel guidance, correct hub seating, and precise geometry maintenance, which translates to safe and predictable vehicle handling. Thanks to its factory design for the Audi brand, it ensures proper integration with the chassis without the need for modifications.

Specifications and technical data

• SKU: 5Q0407255Q-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 5Q0407255Q
• Substitutable numbers: 5Q0407255Q, 5Q0 407 255 Q
• Location on the vehicle: Front, Left
• Category: Wheel Bearings, Hubs & Seals

Purpose and Function in the Chassis

The knuckle with hub, mounted on the front, left side, operates at a critical point of the suspension, connecting steering, braking, and structural components. It is responsible for:

• stable seating of the wheel hub and bearing,
• maintaining correct camber and toe angles,
• secure connection with the shock absorber, control arm, and tie rod end,
• transferring loads from the wheel to the body during driving, braking, and maneuvering.

A properly selected knuckle with hub helps reduce uneven tire wear, improves stability at higher speeds, and supports precise steering system operation.

Benefits of Using an Original Audi Component

The component designed for the Audi platform ensures a construction consistent with the manufacturer's factory specifications. In practice, this means:

• geometry aligned with the Audi A3 8V suspension design,
• compatibility with factory mounting points for the shock absorber, control arms, and brake caliper,
• appropriate rigidity and resistance to operational loads,
• the ability to use existing mounting points without additional adaptations.

For the user, this translates to easier installation, predictable vehicle behavior after repair, and maintaining driving characteristics close to factory settings.

Application in Suspension Repairs and Diagnostics

The front left knuckle with hub is particularly important for repairs after collisions, impacts with curbs, or driving over deep potholes. Replacing this component is recommended when:

• wheel geometry parameters are difficult to set,
• there are noticeable play in the wheel mounting area,
• there are signs of deformation or cracks around the mounting points,
• unusual noises are heard from the hub area during driving.

Choosing a knuckle consistent with the Audi A3 8V design allows for restoring correct vehicle handling and facilitates subsequent geometry adjustment at a diagnostic station.

Used Condition – An Informed Technical Choice

The presented component is in used condition, allowing for a combination of reasonable repair costs with the preservation of original Audi construction. For many users, this is a practical solution, especially for major suspension repairs where both quality and budget are important. If you want to better understand how to responsibly use second-hand parts and what to look for when choosing them, it's worth reading the article Used Car Parts: Myths and Facts You Need to Know, which dispels the most common doubts related to such components.

System Expansion – Related Components

When replacing the knuckle with hub, other components from the same group are often considered, such as wheel bearings, bushings, or additional hubs, to comprehensively refresh the front suspension. If you are planning a comprehensive repair or upgrade of the front suspension area in your Audi and need other parts from the same group, such as additional hubs, wheel bearings, or mounting bushings, check the available parts in the Audi Bearings, Wheel Hubs, and Bushings category.