BMW G20 Control Arm Support Rear Left N/S Suspension Wishbone Link 6878631

BMW G20 Control Arm Support Rear Left N/S Suspension Wishbone Link is an original suspension system component designed for the left side of the rear axle. Thanks to its precise geometry and factory fitment, it ensures stable vehicle handling, predictable cornering behavior, and consistency with the factory BMW suspension characteristics.

Specifications and technical data

• SKU: 6878631
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6878631
• Substitutable numbers: 6878631, 33326878631
• Location on the vehicle: Rear, Left
• Category: Control Arms, Ball Joints & Assemblies

Purpose and function in the BMW G20 suspension

This control arm support belongs to the Control Arms and Ball Joints category, responsible for wheel guidance and transferring loads between the chassis and the running gear. It is mounted on the rear axle on the left side, where it works in conjunction with other suspension arms, bushings, and ball joints to maintain proper wheel alignment and camber angles.

A properly selected and functional control arm support helps reduce unwanted play, improves steering precision, and supports even tire wear. This is particularly important in modern BMW 3 Series designs, where the multi-link suspension system requires maintaining exact geometric parameters.

Benefits of using an original BMW component

Using an original BMW G20 Control Arm Support Rear Left N/S Suspension Wishbone Link allows for the preservation of factory mounting points and the correct rigidity of the entire system. As a result:

• predictable vehicle handling characteristics are maintained,
• the risk of premature wear of tires and other suspension components is reduced,
• it is easier to achieve correct geometry when performing wheel alignment after repairs.

This component is highly recommended for post-collision repairs, replacing worn control arms, or when diagnosing knocks and play in the rear axle. Selecting parts that meet factory specifications facilitates service work and eliminates the need for additional modifications.

Installation characteristics and application

The rear left control arm support is designed for installation in the rear axle area on the driver's side. The manufacturer's design allows for the correct transfer of longitudinal and lateral forces, which is significant both during braking and dynamic cornering.

When replacing, it is recommended to check other suspension system components – bushings, ball joints, and other arms – to ensure the consistent operation of the entire system. After installation, it is necessary to perform a geometry adjustment to fully utilize the potential of the newly installed component.

Condition and origin of the component

The offered control arm support comes from disassembly and is sold as a used part. Such components are a popular choice for economical repairs, where combining original quality with a reasonable cost is important. Before being offered for sale, the component is verified for its suitability for further use.

Expanding knowledge about suspension and selecting other components

If you want to better understand how the suspension system in your car works, what role control arms, stabilizers, and shock absorbers play, and when they should be replaced, check out our guide: Suspension system – a comprehensive guide to shock absorbers, control arms, and stabilizers. It is a practical source of knowledge when planning repairs and diagnostics.

If you are planning a comprehensive repair or upgrade of the rear suspension area in your BMW and need other elements from the same group, such as additional control arms, ball joints, or supports, check out the available parts in the BMW Control Arms and Ball Joints category.