BMW 1 Series E87 120d M47N2 Rear Left N/S Suspension Leg Axle Brake Disc

BMW 1 Series E87 120d M47N2 Rear Left N/S Suspension Leg Axle Brake Disc is an original rear suspension component designed for the left-hand drive axle. Thanks to its factory geometry and precise fitment for the specific engine version, it ensures stable handling, correct power transmission, and predictable vehicle behavior during daily operation. This is a solution for users seeking consistency with the original BMW design and guaranteed compatibility with the chassis system.

Specifications and technical data

• SKU: 6774809-14
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6774809
• Substitutable numbers: 33326774809, 6774809, 34216768693, 6768693, 33217547075, 7547075, 33217533445, 7533445, 33326774805, 6774805, 33326757079, 6757079, 33326761581, 6761581, 34216764651, 6764651, 34216855007, 6855007
• Location on the vehicle: Rear, Left
• Category: Other Steering & Suspension Parts

Purpose and function in the chassis system

The steering knuckle with axle shaft on the rear left side is responsible for precise wheel guidance, maintaining proper suspension geometry, and transferring torque to the drive wheel. In the BMW 1 Series E87 model with the 163 HP M47N2 engine, this component works with other suspension and drivetrain parts to create a cohesive system responsible for:

• maintaining a stable position of the hub and wheel relative to the body,
• proper operation of bearings and mounting elements,
• efficient power transmission to the rear axle,
• preserving factory camber and toe-in angles.

As a result, the car maintains predictable steering responses, and the drivetrain operates under conditions consistent with the manufacturer's specifications.

Compatibility and part identification

The offered component comes from the BMW group and is dedicated for use on the rear left axle. For the correct selection of the steering knuckle with axle shaft, it is crucial to match it to the specific body and engine version; therefore, before purchasing, it is worth verifying compatibility with your vehicle using the OEM number and interchangeable numbers assigned to this reference.

If you want to check step-by-step how to correctly select parts by OEM or VIN number, our practical guide will be helpful: how to choose the right car part by VIN and OEM number. There, you will find a procedure scheme, a list of checklist questions, and tips that will facilitate verifying the part's compatibility with your BMW.

Performance characteristics and benefits of the OEM solution

Using an original steering knuckle with axle shaft in the BMW E87 120d M47N2 allows for maintaining consistency with the factory suspension design. The main benefits include:

• factory mounting points – no modifications required, the element works with stock control arms, shock absorbers, and the hub,
• maintaining the stiffness and suspension performance characteristics designed by the manufacturer,
• proper load transfer from the wheel to the body, which reduces the risk of premature wear of other components,
• easier geometry adjustment after installation due to compliance with factory reference values.

Choosing an original solution is particularly important in cars where predictable handling, stability at higher speeds, and even tire wear are essential. Consistency with the factory suspension design translates into driving comfort and safety.

Vehicle placement and installation aspects

The steering knuckle with axle shaft is intended for installation on the rear left side. Correct placement is crucial for maintaining proper geometry and correct interaction with the drivetrain. During installation, it is recommended to:

• check the condition of cooperating suspension and drivetrain elements,
• replace worn bolts and mounting elements with new ones of the appropriate strength class,
• perform a measurement and adjustment of the rear axle geometry after completing the work.

This approach allows you to fully utilize the potential of the offered component and limit the risk of subsequent vehicle handling issues.

Product condition and practical application

The offered steering knuckle with axle shaft is a used part, which in practice means the possibility of an economical repair of the chassis system while maintaining the original BMW design. This solution is particularly beneficial for mechanical damage resulting from collisions, hitting an obstacle, or operational wear of suspension components.

If you are planning a comprehensive repair or upgrade of the rear suspension area in your BMW and need other elements from the same group, such as control arms, hubs, or mounts, check the available parts in the Other BMW category.

Technical knowledge and project development

Those interested in comparing design solutions across different brands and models, including sports versions, can use our comparative material: Audi RS vs other models – what is hidden under the hood and chassis?. The article discusses differences in engine, brake, and chassis construction, which helps to better understand how important it is to select the right suspension and drivetrain components, even in daily-driven cars like the BMW 1 Series.