BMW E90 E91 E92 E93 Wheel Ventilated Brake Disc Rear Left Right N/O/S 6855004

BMW E90 E91 E92 E93 Wheel Ventilated Brake Disc Rear Left Right is an original braking system component from the Brake discs group, designed for installation on the rear axle in selected 3 Series models. The ventilated design ensures stable heat dissipation, which translates into repeatable, predictable braking and better vehicle control. This used OEM component is a sensible choice for drivers looking for a technically matched solution at an attractive price.

Specifications and technical data

• SKU: 6855004-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6855004
• Substitutable numbers: 34216855004, 6855004, 34216764655, 6764655
• Location on the vehicle: Rear, Right, Left
• Part type: Brake Disc Rotor
• Category: Brake Disc Rotors

Purpose and vehicle placement

The presented brake disc is designed to work on the rear axle of the vehicle and can be mounted on both the left and right sides. This solution facilitates the selection of parts when servicing the braking system in BMW E90, E91, E92, and E93 series, allowing for a consistent refresh of the entire rear braking zone. Thanks to the precise fit for the specific BMW platform, the correct operating parameters of the calipers, pads, and braking assistance systems are maintained, which is important for both safety and the durability of other system components.

Construction of the ventilated brake disc

The ventilated design of the disc promotes effective heat dissipation generated during intensive braking. This reduces the risk of overheating the working surface, limits the fading phenomenon, and helps maintain a stable friction coefficient over a wider temperature range. The original workmanship characteristic of the BMW brand ensures:

• appropriately selected mass and geometry of the disc,
• proper balancing to minimize vibrations,
• compatibility with factory calipers and brake pads.

Benefits of using an original, used BMW disc

Choosing a used OEM brake disc is a solution that allows you to maintain the factory braking characteristics while reducing service costs. The original component is designed with a specific vehicle platform in mind, thanks to which:

• compliance with vehicle safety systems is maintained,
• the risk of installation problems is reduced,
• the operating parameters of the system intended by the manufacturer are maintained. For many users of the BMW E9x series, this is a practical way to maintain the efficiency of the braking system without sacrificing the quality of factory parts.

Selection and operation in the BMW braking system

When replacing discs on the rear axle, it is recommended to install a pair of elements on both sides to maintain uniform operation of the braking system. It is also worth verifying the condition of the pads, calipers, and lines, which will help avoid uneven wear and improve braking stability in the long term. 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, pads, or brake lines, check the available parts in the BMW brake discs category.

Technical support and knowledge about recycled parts

When selecting braking system components from dismantling, it is worth using proven sources and reliable technical information. Practical tips on the safe use of used brake components, optimization of service costs, and principles of proper installation can be found in the article Brake calipers under the microscope: How to effectively reduce the costs of repairing the braking system by choosing proven recycled parts. If you operate an older BMW and encounter problems with the availability of new components, tips from the guide No parts at the dealership? How to deal with the repair of older models thanks to parts from dismantling, where practical aspects of selecting elements from the secondary market are discussed, may also be helpful.