Brake Disc BMW E82 E88 123d Rear Left Right N/O/S Wheel Disc Set 300X20

BMW E82/E88 123d Rear Brake Discs are an original set of rear discs for the left and right sides, designed for the drive axle of BMW 1 Series 123d models. The set, with a working diameter of 300 mm and a thickness of 20 mm, ensures stable, predictable braking and maintains the original braking system's performance characteristics. This is a solution for drivers who want to maintain consistent braking parameters with the manufacturer's specifications and avoid fitting issues.

Specifications and technical data

• SKU: 6855236
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6855236
• Substitutable numbers: 6855236, 34216855236
• Location on the vehicle: Rear, Right, Left
• Category: Brake Disc Rotors

Intended Use and Fitment for BMW 123d

The presented set belongs to the Brake Discs category and has been specifically designed for the rear axle of the BMW 1 Series in the 123d version with E82 and E88 body styles. Using a dedicated set for the left and right sides allows for maintaining the correct braking system geometry, appropriate friction surface, and proper interaction with the calipers and pads intended for this model.

A diameter of 300 mm and a thickness of 20 mm are characteristic parameters for this drive configuration, which helps maintain an even distribution of braking force between the front and rear of the vehicle. This ensures the car remains stable during intense braking, both in daily use and during dynamic highway driving.

Technical Characteristics of the Disc Set

The set includes two discs mounted on the rear axle – on the left and right sides – allowing for simultaneous replacement of both elements in a single service operation. This approach is recommended for safety reasons, as it ensures uniform thickness and working surface condition on both sides of the axle.

The 300x20 mm dimensions have been selected by the manufacturer for optimal heat dissipation, disc rigidity, and compatibility with factory BMW calipers. The appropriate mass and cross-section of the disc contribute to thermal stability, reducing the risk of overheating and braking performance loss during repeated, strong braking.

Benefits of Using Genuine BMW Discs

Choosing genuine brake discs for the BMW 123d allows you to maintain the original braking system's performance parameters without the need to modify other components. Key advantages of this solution include:

• Precise fitment to the hub, calipers, and pads intended for the rear axle of the 123d model.
• Consistent braking characteristics with assistance systems such as ABS or stability control.
• Uniform disc diameter and thickness on both sides of the axle, promoting even pad wear.
• Reduced risk of vibrations and pedal judder by maintaining factory manufacturing tolerances.

A used product can be an attractive cost-effective alternative, especially for budget repairs, provided that wear is assessed correctly and professional installation is performed. This solution is often chosen for phased brake system renovations where maintaining the original vehicle specification is a priority.

Professional Installation and Operation

To fully utilize the potential of this set, installation in a specialized workshop is recommended, following manufacturer procedures – including checking the condition of the hubs, caliper guides, and selecting appropriate brake pads. Replacing discs on both sides of the axle in a single service cycle helps maintain stable, predictable vehicle behavior during braking.

Before installation, it is advisable to verify the compatibility of the part with the specific engine and equipment version of the BMW 123d, using the OEM part number and interchangeable numbers available in the technical specification. This minimizes the risk of error and ensures full compatibility with the braking system of the specific vehicle.

Brake System Expansion and Additional Materials

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

When selecting used brake system components – including discs, calipers, and ABS-related parts – it is advisable to follow a proven procedure for verifying technical condition. A detailed checklist on how to safely choose used brake components in specialized stores can be found in the article “Second-hand Braking System: How to Safely Choose Discs, Calipers, and ABS?”, which helps in making informed purchasing decisions.