BMW 1 Series E87 120d Front Left N/S Spring Strut Brake Suspension Leg Hub Axle

Description

BMW 1 Series E87 120d Front Left N/S Spring Strut Brake Suspension Leg Hub Axle is a steering knuckle component designed for the front axle on the driver’s side, dedicated to BMW vehicles. This is a used component from the Suspension replacement kits category, which allows for the restoration of proper wheel geometry and stable vehicle handling following suspension repairs or collisions.

Specifications and technical data

• SKU: 6786017-9
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6786017
• Substitutable numbers: 31316771553, 6771553, 31316786017, 6786017, 31216793923, 6793923, 31216764443, 6764443, 34116854997, 6854997, 34116764641, 6764641, 34116766681, 6766681
• Location on the vehicle: Front, Left
• Category: Suspension Component Replacement Kits

Purpose and function in the suspension

The presented front left McPherson steering knuckle operates within the front strut-type suspension, responsible for the stable mounting of the wheel hub, brake components, and integration with the shock absorber strut. A correctly selected component in this area is crucial for maintaining proper geometry, even tire wear, and predictable vehicle behavior during braking and cornering.

Thanks to the use of an original design intended for a specific axle and side of the vehicle, the installation process is straightforward, and the entire suspension system retains its factory mounting points and performance characteristics.

Compatibility and part identification

The steering knuckle belongs to the Suspension replacement kits group, which facilitates selection during comprehensive front-end repairs. The element was designed specifically for the BMW brand, and its identification is possible via the dedicated OEM part number and associated interchangeable numbers, visible in the technical specifications section. The presence of reference numbers allows for precise matching of the component to a specific engine and equipment version, minimizing the risk of errors when ordering.

The placement on the vehicle, specified as front left, clearly indicates the installation side, which is important when planning the replacement of a single element or a pair of steering knuckles as part of broader suspension service.

Characteristics of the used element

The offered steering knuckle is a Used part, meaning it has been dismantled and was previously in operation on a vehicle. Such components are frequently chosen for economic repairs when the priority is to maintain correct performance parameters while reducing costs compared to new parts. A used original element retains factory geometry and mounting points, which is particularly important for precision suspension parts.

Choosing a dismantled steering knuckle is a practical solution, especially when damage affects only one corner of the vehicle and the goal is to quickly restore full functionality of the steering system while maintaining a reasonable repair budget.

Application in service practice

The front left McPherson steering knuckle is used both for post-accident repairs and for replacing worn or deformed suspension elements. After installation, it is recommended to perform a wheel alignment to fully utilize the potential of the correctly selected component and ensure stable vehicle handling. This element works in conjunction with other steering system parts, such as the shock absorber strut, control arms, or the braking system, creating a cohesive system responsible for safety and driving comfort.

In the case of extensive front-end repairs, especially after significant impacts to the suspension, replacing the steering knuckle with the correct model intended for the specific side of the vehicle helps avoid problems with wheel alignment and uneven tire wear.

Repair expansion and selection of other elements

If you are planning a comprehensive repair or upgrade of the front suspension area in your BMW and need other elements from the same group, such as McPherson struts, control arms, or stabilizers, check the available parts in the BMW suspension replacement kits category.

If you are considering a wider use of dismantled components in your premium class car and want to learn practical tips regarding the selection and cost-effectiveness of such solutions, it is worth reading the article on our blog: Used parts for Mercedes – original dismantled parts, which discusses the approach to using used components in premium segment vehicles.