BMW 3 Series E90 330i N52 Front Left N/S Spring Strut Brake Suspension Leg

BMW E90 330d M57N2 Left Strut and Knuckle Assembly is a complete front suspension component designed for the drive axle of BMW 3 Series E90 models with the M57N2 engine. The connection of the strut to the knuckle assembly on the front, left side ensures proper geometry, driving stability, and predictable vehicle behavior during braking and cornering.

Specifications and technical data

• SKU: 6786001-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6786001
• Substitutable numbers: 31316786001, 6786001, 31314036119, 4036119, 31306771177, 6771177, 31316767323, 6767323, 34116769093, 6769093, 31216793923, 6793923, 34116854999, 6854999, 31216764443, 6768215, 34116764645, 6764645
• Location on the vehicle: Front, Left
• Category: Suspension Component Replacement Kits

Purpose and Function in Suspension

The presented strut-knuckle assembly has been specifically designed for BMW E90 330d models with the M57N2 engine, guaranteeing a perfect fit with the factory suspension architecture. This component operates in a critical area of the drivetrain – on the front, left side of the vehicle – responsible for wheel guidance, vibration damping, and maintaining the correct camber and toe angles.

This configured sub-assembly allows for the characteristic BMW steering precision, reduces undesirable body roll, and improves tire contact with the road surface, which translates to stability during dynamic driving and comfort in everyday use.

Assembly Design and Benefits of Installation

Combining the strut and knuckle into a single assembly simplifies the service process and reduces the risk of installation errors. Using the original BMW design means:

• maintaining factory mounting points for suspension and braking system components,
• correct positioning of the hub and brake disc relative to the caliper,
• proper cooperation with the McPherson strut and front axle control arms.

Thanks to this, achieving correct geometry alignment is easier after replacement, and the car regains predictable responses to steering inputs. This is particularly important in the powerful 330d diesel, where high-speed stability directly impacts safety.

Condition, Origin, and Fitment

This component is from a dismantled vehicle and is offered as a used BMW sub-assembly, allowing for a significant reduction in repair costs compared to a new part while maintaining the original manufacturer's specifications. The assembly is intended for installation on the front, left side of the vehicle, so when planning repairs, it is advisable to check the condition of the corresponding right-side component to maintain suspension symmetry.

For certainty of fitment, you can use the manufacturer's markings – the product has a dedicated OEM part number and related interchange numbers, which facilitates verification of compatibility with a specific version of the BMW E90 330d M57N2.

Application in Service and Modifications

The BMW E90 330d M57N2 Left Strut and Knuckle Assembly is suitable for both standard repairs due to wear and tear, as well as for suspension rebuilds after mechanical damage. Replacing the complete assembly on the front axle allows for:

• restoring proper vehicle handling after a collision or impact with an obstacle,
• reducing knocks and play resulting from excessive wear of guiding elements,
• preparing the car for further suspension modifications, e.g., installing sport springs or reinforced bushings.

For those interested in broader applications of used sub-assemblies in premium vehicles, including other brands, information contained in the article Used Parts for Mercedes – Original Parts from Dismantling, describing the benefits of using original aftermarket elements, may be useful.

Support with Selection and Other BMW Suspension Components

When planning a comprehensive suspension system overhaul, it is worth considering replacing other components that cooperate with the front strut, such as control arms, stabilizer links, or mounting elements, to fully utilize the potential of the newly installed assembly. If you need other suspension components for your car of this brand, check the available parts in the BMW Suspension Replacement Kits category.

For drivers considering further modifications to the car's handling and characteristics, the tuning guide, which describes the use of aftermarket components, can be an inspiration: Best Used Parts for Tuning Your Car.