BMW 3 Series E90 318i N43 Front Left N/S Spring Strut Leg Brake Suspension Hub

BMW 3 Series E90 318i N43 Front Left N/S Spring Strut Leg Brake Suspension Hub is a complete front suspension component designed for the driver's side front axle. The set combines the functions of wheel guidance and vibration damping in one part, which facilitates maintenance and speeds up replacement in BMW 3 Series E90 cars with the N43 engine. By maintaining the factory suspension geometry, it ensures stable handling, predictable vehicle behavior, and proper operation of the running gear.

Specifications and technical data

• SKU: 6771723-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6771723
• Substitutable numbers: 31316786005, 6786005, 31314036113 31316771723, 4036113 6771723, 34116776527 34116854998 31216765157, 6776527 6854998 6765157, 31314036113 31316771723 34116772017, 4036113 6771723 6772017, 34116764643 34116772669, 6764643 6772669
• Location on the vehicle: Front, Left
• Category: Suspension Component Replacement Kits

Purpose and function in the suspension

The presented element belongs to the Suspension replacement kits group and is mounted on the front of the vehicle on the left side. It integrates key functions into a single design: transferring loads from the body to the wheel, guiding the hub in the correct plane, and damping road surface irregularities. This solution allows for maintaining proper toe, camber, and caster angles, which translates into confident handling and even tire wear.

Thanks to the factory architecture, the shock absorber's performance characteristics are matched to the weight and load distribution of the BMW E90 318i with the N43 unit, which helps maintain predictable vehicle behavior both in daily city driving and at higher speeds.

Benefits of using a complete shock absorber with steering knuckle

Using a complete shock absorber-steering knuckle assembly on the left front of the vehicle simplifies the service process and reduces the risk of installation errors. The mechanic does not need to separate the elements, which reduces stress on the mounts and makes it easier to maintain the original position of the mounts relative to the body.

• Easier suspension geometry adjustment after repair.
• Consistent performance characteristics of guiding and damping elements.
• Reduced assembly time compared to replacing individual components.
• Better control over vehicle behavior during braking and cornering.

For the user, this means more stable handling, more precise steering response, and improved ride comfort compared to worn-out suspension elements.

Installation characteristics and fitment

The placement on the vehicle defined as front – left side allows for clear identification of the mounting position in the car. The element is intended for the suspension design used in the BMW 3 Series E90 318i with the 143 HP N43 engine, which ensures proper fitment to the steering knuckle, hub, control arm mounts, and braking system intended for this version.

A properly selected shock absorber and steering knuckle assembly helps reduce unwanted body vibrations, improves tire contact with the road surface, and supports the proper operation of safety systems, such as ABS or electronic stability control, which require stable wheel geometry.

Part condition and practical aspects

The offered item is a used part, which in practice means a beneficial combination of original BMW construction and an attractive price compared to new aftermarket replacements. For many premium car owners, this is a reasonable way to maintain factory handling characteristics without having to resort to cheaper, less predictable non-factory solutions.

During installation, it is recommended to check the cooperating suspension components (control arms, links, mounting bushings) to fully utilize the potential of the newly installed assembly and avoid premature tire wear or deterioration of ride comfort.

Technical support and additional information

Dedicated manufacturer markings and interchangeable numbers are provided for this model, which facilitates verification of compatibility with a specific version of the BMW E90 318i N43. In case of doubt, it is worth comparing the vehicle's catalog data with the information in the technical specification to ensure that the correct element for the left side of the front axle is being selected.

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 shock absorber struts, springs, or steering knuckles for the opposite side, check the available parts in the BMW suspension replacement kits category.

To maximize the potential of such a dismantled component and limit its wear in the future, it is worth reading practical tips on operation and maintenance – you will find them in the article How to extend the life of used car parts?, which describes, among other things, good practices for suspension and other subassemblies.