BMW E91 Touring 325d M57N2 Rear Left N/S Axle Leg Suspension Brake Disc Hub

BMW E91 Touring 325d M57N2 Rear Left N/S Axle Leg Suspension Brake Disc Hub is a complete, used set of rear suspension and braking system components for the left side, designed for BMW 3 Series E91 models. This is a solution for users who expect factory geometry, solid construction, and component consistency in one matched set. This reduces the risk of installation problems and restores the proper operation of the rear axle.

Specifications and technical data

• SKU: 6774807-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6774807
• Substitutable numbers: 33326774807, 6774807, 34216769101, 6769101, 34216855004, 6855004, 33326757735, 6757735, 34216764655, 6764655, 33217533449, 7533449, 33217561783, 7561783
• Location on the vehicle: Rear, Left
• Category: Suspension Component Replacement Kits

Purpose and function of the set

The presented set from the Suspension replacement kits category covers the rear left side of the vehicle and integrates elements responsible for both wheel guidance and effective braking. The steering knuckle serves as a rigid mounting point for the hub, control arms, and brake hardware, ensuring proper wheel alignment relative to the body and stable vehicle handling in corners.

Combining the steering knuckle with the braking system in one assembly allows for component consistency, which is particularly important during post-collision repairs, replacing damaged suspension elements, or restoring the original handling characteristics typical of BMW.

Construction and key technical features

The set covers the rear left side of the vehicle, which facilitates part selection in case of one-sided suspension damage. The steering knuckle works with the factory BMW multi-link system, transferring loads from the wheel to the body and maintaining stable axle geometry. Integrated brake components are responsible for transferring braking force directly to the wheel, which translates into predictable vehicle behavior during heavy braking.

The original BMW origin means that the component was designed for a specific platform, maintaining appropriate dimensional and material tolerances. As a result, compatibility with factory mounts, brake lines, and other rear suspension elements is maintained.

Selection, compatibility, and replacement numbers

The item has a dedicated OEM part number and associated interchangeable numbers, which facilitates precise identification in BMW catalogs and part selection tools. When purchasing, it is worth comparing the markings with the vehicle documentation or the removed part to confirm full compatibility with the specific body version and braking system.

Due to the presence of multiple reference numbers, the set can be used as a replacement for several factory variants, which increases selection flexibility during service repairs and reduces the need to search for individual components.

Condition, application, and benefits of installation

The product is used, which allows for an economical repair of the rear suspension while maintaining the original BMW construction. This type of set is particularly useful in situations where there has been damage to the steering knuckle, deformation of mounts, or problems with proper wheel alignment and camber settings.

By choosing a complete rear left steering knuckle assembly with brakes, you gain:

• consistency of suspension and brake elements on one side of the vehicle,
• easier installation thanks to factory mounting points,
• restoration of predictable handling and rear axle stability,
• a solution tailored to BMW's driving characteristics.

Technical support and additional materials

If you are planning a comprehensive repair or upgrade of the suspension zone in your BMW and need other elements from the same group, such as steering knuckles, control arms, or complete rear axle modules, check out the available parts in the BMW suspension replacement kits category.

When selecting used suspension elements, it is worth paying attention to the structural differences between standard and sports versions and the specific operation of individual components – this is discussed in more detail in the article Standard vs. sports suspension – construction differences and selecting used parts, which will help you consciously plan the repair or modernization of the chassis.

Additional tips regarding the operation and maintenance of used suspension elements are provided in the guide How to extend the life of used car parts, where you will find practical service recommendations that allow you to reduce wear and extend the trouble-free operation time of the components.