BMW 1 Series E88 Cabrio 120d N47 Rear Left N/S Suspension Leg Axle Brake Disc

BMW 1 Series E88 Cabrio 120d N47 Rear Left N/S Suspension Leg Axle Brake Disc is an original rear suspension component designed for the left-hand drive axle of the BMW 1 Series Cabrio E88 model with the N47 engine. This solution allows for maintaining the correct geometry, stability, and predictable handling of the vehicle, which is particularly important with the 177 HP power output. Thanks to its factory design, the component works seamlessly with the standard suspension and drivetrain architecture, facilitating precise repairs without the need for structural modifications.

Specifications and technical data

• SKU: 6774809-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6774809
• Substitutable numbers: 33326774809, 6774809, 34216768693, 6768693, 33217547075, 7547075, 33217533445, 7533445, 34216855005, 6855005, 33326774805, 6774805, 33326757079, 6757079, 33326761581, 6761581, 34216778051, 6778051
• Location on the vehicle: Rear, Left
• Category: Other Steering & Suspension Parts

Purpose and function in the chassis system

The steering knuckle with the rear half-shaft on the left side is responsible for transferring drive to the wheel and maintaining the correct position of the hub relative to the suspension. In practice, this means stable handling, correct alignment and camber settings, as well as even load distribution to the body.

The placement on the vehicle, specified as rear – left side, allows for precise matching of the part to a specific suspension corner, which is crucial for post-accident repairs, replacement after mechanical damage, or eliminating play and handling irregularities.

Compatibility and fitment for BMW 1 Series E88 Cabrio 120d N47

The presented component has been designed to work with the drivetrain based on the 177 HP N47 engine, ensuring consistency with factory suspension and drive parameters. As a result, the correct rear axle geometry is maintained, along with proper interaction with other components – control arms, shock absorbers, springs, and the braking system.

The original BMW OE origin means that the part was manufactured according to the vehicle manufacturer's standards, which translates into appropriate rigidity, precise mounting point alignment, and compatibility with standard assembly components.

Characteristics of the used component

The offered steering knuckle with half-shaft is a used component, sourced from dismantling, which represents a reasonable compromise between repair costs and maintaining the original BMW design. Such components are frequently chosen for post-accident repairs when it is essential to restore factory geometry without interfering with the suspension design.

Choosing a used OEM component reduces the risk of fitment issues often encountered with aftermarket parts that have inconsistent manufacturing tolerances. It is a practical solution for workshops and users who expect predictable installation and the preservation of standard driving characteristics.

Benefits of using an original steering knuckle with half-shaft

• Factory mounting points – facilitate installation and allow for correct rear axle geometry alignment.
• Consistency with the N47 drivetrain – ensures proper torque transfer to the left rear wheel.
• Reduction of vibrations and unwanted play in the suspension due to the original design.
• Reasonable repair cost while maintaining a component from the BMW OE group.

Application in service practice

The steering knuckle with the left rear half-shaft is particularly important for repairs following mechanical damage, such as curb impacts, side collisions, or drivetrain failures. Replacing the complete assembly often allows for faster vehicle restoration than repairing individual sub-assemblies, while also facilitating subsequent wheel alignment on a measuring stand.

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

Technical support and knowledge about drivetrain systems

When selecting rear drive axle components – especially in higher-power vehicles – it is worth considering the vehicle's usage and the condition of other components. It is good practice to simultaneously check the differential, bearings, mounts, and other half-shafts to avoid returning for repairs in the near future.

To expand your knowledge about the differences in the design of sports drivetrain and braking systems compared to standard models, you can read the article: Audi RS vs other models – what is hidden under the hood and chassis?, which discusses, among other things, the impact of more powerful engines and modified chassis on the selection of spare parts.