BMW G20 320d B47B Front Left N/S Suspension Leg Spring Strut Hub Brake Disc

BMW G20 320d B47B Front Left N/S Suspension Leg Spring Strut Hub Brake Disc is a complete, used front suspension assembly designed for the front left side of the vehicle. This set combines key steering and braking system components into a single unit, facilitating easier maintenance and ensuring a consistent, technically correct replacement for this section of the chassis. By maintaining factory geometry, it serves as a solid foundation for repairing or rebuilding the front of the vehicle.

Specifications and technical data

• SKU: 6888453-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6888453
• Substitutable numbers: 6888453, 31316888453, 31206878609, 6878609, 34116860266, 6860266, 34106890789, 6890789
• Location on the vehicle: Front, Left
• Category: Suspension Component Replacement Kits

Purpose and function of the set

The presented set from the Suspension replacement kits category includes an assembly of components responsible for wheel guidance, transferring loads from the body to the road, and interacting with the braking system. It consists of: a suspension leg, steering knuckle, hub, brake disc, and caliper, allowing for the replacement of the entire module on the left side of the front axle in a single service process.

This solution is particularly beneficial in cases of damage resulting from collisions, curb impacts, or major failures of rolling components, where simultaneous inspection of several sub-assemblies is necessary. Using a complete module facilitates the maintenance of correct suspension geometry and handling stability, which directly impacts driving safety.

Module construction and benefits of complete replacement

Combining the suspension leg, steering knuckle, hub, disc, and caliper into one set ensures structural consistency and reduces the risk of incorrect selection of individual parts. The module operates in a critical area of the vehicle's front, responsible for:

• wheel guidance in the vertical and horizontal axes,
• stable hub mounting and interaction with the wheel bearing,
• correct positioning of the brake disc relative to the caliper,
• effective transfer of braking forces to the suspension and body.

Because all components come from a single system, it is easier to maintain proper assembly tolerances and avoid issues such as disc runout, uneven brake pad wear, or incorrect wheel alignment relative to the wheel arch. This translates into more predictable vehicle behavior during braking and cornering.

Compatibility, installation, and identification parameters

The part is dedicated to the front left side, which is crucial when selecting parts for the front axle. Identification information, such as the SKU, OEM part number, and available interchangeable numbers, has been assigned to the product in the technical specification to allow for precise matching to a specific BMW 3 Series G20 configuration with the B47B engine. It is recommended to verify these against the vehicle's VIN and service documentation to avoid ordering errors.

As a part branded by BMW, the set maintains the factory characteristics of the suspension and braking system. The used condition of the component allows for an economical repair while maintaining the original design, which is essential for preserving driving properties and compliance with the manufacturer's specifications.

Practical application and service aspects

Replacing the complete module on the front left side is particularly recommended when:

• mechanical damage has occurred following a collision or a heavy impact to the suspension,
• excessive play or wear of several components has been identified simultaneously,
• a quick, consistent repair is required without sourcing individual parts from different suppliers.

This approach reduces workshop labor time, simplifies the diagnostic process, and decreases the risk of subsequent claims related to the inconsistent condition of individual components. A complete suspension replacement kit in this area allows for the restoration of proper vehicle handling and braking stability without the need for multiple disassemblies.

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 additional suspension legs, steering knuckles, or complete hub-disc-caliper modules, check out the available parts in the BMW suspension replacement kits category.

Selecting used suspension components – practical knowledge

When choosing used suspension and brake components, it is worth paying attention to structural compatibility, the condition of working surfaces, and fitment for the specific engine and body version. A well-chosen set allows for the preservation of factory damping characteristics, system rigidity, and appropriate braking efficiency, which directly impacts driving comfort and safety.

To better understand the differences between standard and sports solutions and to make informed decisions regarding the purchase of used suspension parts, it is worth reading our guide: Standard vs. sports suspension – differences in construction and is it worth buying used suspension parts?.