Rotor BMW 3 E90 X1 E84 Front Wheel Left Right Ventilated Brake Disc 312X24mm

Description

Visual condition of the part

The product shows signs of use visible in the photos.

Rotor BMW 3 E90 X1 E84 Front Wheel Left Right Ventilated Brake Disc 312X24mm is an original BMW braking system component, designed for installation on the front axle on either the left or right side. Thanks to its ventilated design and precise fit for the specific working diameter, it ensures stable braking performance and predictable vehicle behavior during daily operation. This is a solution for users who expect consistent braking system performance and compatibility with the factory BMW configuration.

Specifications and technical data

• SKU: 6855006
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6855006
• Substitutable numbers: 6855006, 34116855006
• Location on the vehicle: Front, Left, Right
• Category: Shocks, Struts & Assemblies

Purpose and compatibility

The presented brake disc has been designed as a front axle component for BMW 3 Series E90 and BMW X1 E84 models. The design allows for installation on both the left and right sides, which facilitates part selection when servicing both wheels simultaneously. Using an original BMW solution allows for maintaining factory braking system performance parameters and proper fitment with the calipers and pads intended for these models.

Construction of the ventilated brake disc

The disc belongs to the group of components with a ventilated design, which means there are channels between the working surfaces. This layout promotes effective heat dissipation generated during intensive braking, reduces the risk of overheating, and helps maintain a stable friction coefficient. In practice, this translates into:

• more repeatable braking effectiveness during successive braking cycles,
• reduced susceptibility to thermal fading,
• better cooperation with brake pads selected according to factory BMW specifications.

Role in the braking system and suspension

Although the product is classified in the Shock absorbers and struts group, it functionally constitutes a key element of the braking system that works with the hub, caliper, and pads. A correctly selected disc influences vehicle stability during braking, and thus the behavior of the entire front end of the car, including suspension operation. Proper heat dissipation and even wear of the working surface reduce vibrations transmitted to the suspension struts, which promotes driving comfort and steering precision.

Part condition and service application

The offered brake disc is a used component, which makes it an attractive cost-effective alternative while maintaining original BMW specifications. It can be used both for standard replacement of worn components and for post-accident repairs, where maintaining compliance with the factory braking system geometry is essential. Choosing an original disc from this group allows for reducing the risk of fitment issues and ensures predictable vehicle behavior after service.

Technical support and knowledge development

For users interested in a broader perspective on the operation of components working with the brake disc – such as suspension struts, control arms, or stabilizers – a guide describing the relationships between these sub-assemblies will be helpful. Practical tips regarding diagnostics and operation can be found in the article Suspension system – a comprehensive guide to shock absorbers, control arms, and stabilizers, which allows for a better understanding of the impact of suspension condition on braking effectiveness.

Service expansion within the same group

If you are planning a comprehensive repair or upgrade of the suspension and wheel steering zone in your BMW and need other elements from the same group, such as struts, mounts, or components working with the hub, check the available parts in the BMW shock absorbers and struts category.

To shorten the car’s downtime in the workshop and better plan a larger scope of service work, it is worth knowing the benefits of using a single, well-stocked parts warehouse. Practical information on this topic can be found in the material how a wide assortment in one warehouse shortens car downtime at the mechanic, which can help in optimally planning repairs related to the braking and suspension system.