BMW 1 3 E81 E87 E90 E91 Rear Left Right Wheel Ventilated Brake Disc 300X20

BMW 1 3 E81 E87 E90 E91 Rear Left Right Wheel Ventilated Brake Disc 300X20 is an original BMW braking system component designed for installation on the rear axle, on either the left or right side. The ventilated disc design supports stable heat dissipation, which translates into reliable brake performance during daily operation.

Specifications and technical data

• SKU: 6864901
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6864901
• Substitutable numbers: 34216864901, 6864901, 34216855008, 6855008, 34216764653, 6764653
• Location on the vehicle: Rear, Right, Left
• Category: Brake Disc Rotors

Purpose and vehicle placement

The presented disc belongs to the Brake discs category and is designed for use on the rear axle of BMW E-series vehicles. It is suitable for both the right and left side, which facilitates selection during full-axle service and helps maintain consistent braking system performance parameters.

The ventilated structure of the rear disc helps maintain a stable operating temperature during braking, which reduces the risk of brake fade during more intensive driving and supports even brake pad wear.

Technical and functional characteristics

The brake disc was developed as an OEM component for BMW braking systems, ensuring proper working geometry, fitment with calipers, and compatibility with factory safety systems. The ventilated design provides controlled heat energy dissipation, which is important during frequent braking in city traffic and on the highway.

Its original BMW group origin ensures appropriate disc rigidity, friction surface stability, and predictable behavior during emergency braking. This solution allows you to maintain the factory characteristics of the braking system without the need for aftermarket replacements with unverified parameters.

Condition of the item and benefits of choosing a used part

The offered disc falls into the used parts category, which allows for lower maintenance costs while maintaining the manufacturer's original specifications. Choosing such a component is particularly beneficial for vehicles used on a daily basis, where a reasonable balance between price and quality is important.

A used BMW brake disc can be a good solution for staged braking system repairs, replacing individual components, or restoring a vehicle to working order after mechanical damage. Maintaining the original design promotes proper fitment to the hub, caliper, and other rear axle components.

Selection, compatibility, and service aspects

The item has a dedicated OEM part number and associated interchangeable numbers, which facilitates precise identification in service catalogs and parts selection systems. This allows for efficient verification of the disc's compatibility with a specific version of the BMW E84, E91, or E93, minimizing the risk of ordering errors.

During installation, standard service procedures are recommended: checking the condition of the hub, fasteners, and mating brake pads. A properly selected and installed rear ventilated disc supports uniform braking system operation and stable vehicle handling during braking.

If you are planning a comprehensive repair or upgrade of the braking zone in your BMW and need other elements from the same group, such as additional discs, compatible pads, or brake lines, check the available parts in the BMW Brake discs category.

Expert support and repair cost optimization

When planning braking system service, it is worth paying attention to the selection of other components, especially calipers. Helpful information on the safe use of original recycled parts can be found in the article Brake calipers under the microscope: How to effectively reduce braking system repair costs by choosing verified recycled parts, which discusses practical aspects of operating and selecting used components.