BMW 1 SERIES E82 E88 300X20 123d REAR VENTILATED BRAKE DISC LEFT/RIGHT N/O/S

BMW 1 SERIES E82 E88 300X20 123d REAR VENTILATED BRAKE DISC LEFT/RIGHT N/O/S is an original brake system component from the Brake discs category, designed for installation on the rear axle of selected BMW 1 Series models. The product comes from dismantling, which allows for maintaining factory fitment and operating characteristics while reducing service costs.

Specifications and technical data

• SKU: 6778049
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 34216778049
• Substitutable numbers: 34216778049, 6778049, min.th. = 18, 4 mm
• Location on the vehicle: Rear
• Category: Brake Disc Rotors

Purpose and function in the brake system

The rear brake disc in the BMW E82/E88 series is responsible for stable deceleration and proper distribution of braking force between the axles. Using the correct disc model with the appropriate diameter and working thickness ensures:

• consistent operation with the factory ABS system and electronic stability control systems,
• even wear of brake pads on the rear axle,
• predictable vehicle behavior during emergency braking.

By maintaining factory design parameters, BMW 1 SERIES E82 E88 300X20 123d REAR VENTILATED BRAKE DISC LEFT/RIGHT N/O/S allows for maintaining braking characteristics consistent with the vehicle manufacturer's specifications.

Selection and technical compatibility

The disc in question is designed as a component mounted on the rear axle, taking into account the specific requirements of the BMW E82/E88 platform. Proper selection of parts for a specific engine version and vehicle equipment should consider:

• compliance with the OEM part number and interchangeable numbers,
• working diameter and disc thickness,
• type of brake caliper and pads used.

In practice, this means that when replacing, it is worth comparing the old disc with the offered component and verifying the markings in the vehicle's service documentation to maintain full mechanical and functional compatibility.

Performance characteristics and advantages of using an OEM used part

An original BMW rear brake disc, even as a used component, retains the key design features provided by the vehicle manufacturer. The most important advantages of such a solution include:

• factory fitment to the hub, caliper, and brake hardware,
• consistency with brake system operating parameters,
• possibility of economical repair while maintaining the original specification.

The technical specification description also includes the minimum permissible working thickness, which facilitates the assessment of the disc's suitability for further use and allows for an informed service decision.

Application in service practice

Replacing the rear brake disc in a BMW E82/E88 is a standard service operation, usually performed together with replacing the brake pads on the same axle. A properly selected disc:

• reduces the risk of vibrations and judder on the brake pedal,
• supports even wear of friction elements,
• ensures stable braking across the full range of vehicle loads.

Due to its location on the rear axle, this component has a significant impact on vehicle stability during braking on slippery surfaces and during the operation of driver assistance systems.

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

Safety, economy, and technical knowledge

When choosing used brake system components, it is crucial to understand how to assess their condition and how to properly select them for a specific model. In the case of brake discs and calipers, it is worth relying on original components that maintain the parameters provided by the vehicle manufacturer. To learn more about the principles of selecting and operating recycled brake components, it is worth reading our expert material: Brake calipers under the microscope: How to effectively reduce brake system repair costs by choosing proven recycled parts.

Summary

BMW 1 SERIES E82 E88 300X20 123d REAR VENTILATED BRAKE DISC LEFT/RIGHT N/O/S is a practical solution for users who want to maintain the original braking characteristics of their BMW at reasonable service costs. A properly selected and installed rear brake disc supports vehicle stability, improves braking comfort, and allows for maintaining the consistency of the entire brake system with the manufacturer's factory specification.