Mini F55 F56 Brake Caliper Rear Left Brake Unit Housing 36/10/259

Mini F55 F56 Brake Caliper Rear Left Brake Unit Housing is an original BMW braking system component designed for installation on the rear left axle of the vehicle. This used brake caliper from this series is a solution for drivers who want to maintain factory braking characteristics while optimizing service costs. By maintaining specific geometry and clamping force, this component supports stable, predictable brake performance in daily operation.

Specifications and technical data

• SKU: 6860557
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6860557
• Substitutable numbers: 34216860557, 6860557, 34216865927, 6865927
• Location on the vehicle: Rear, Left
• Category: Calipers & Brackets

Purpose and compatibility with the braking system

The presented caliper is part of the Brake calipers and brackets category, which means it is responsible for generating clamping force of the pads against the disc on the rear left side of the vehicle. The placement on the vehicle has been clearly defined as rear – left side, which facilitates the correct selection of the component during repair or replacement of a unilaterally worn caliper.

The original origin from the BMW group promotes compatibility with the factory hydraulic system, lines, and body mounts. As a result, installation is straightforward, without the need for structural modifications or the use of adapters.

Technical and functional characteristics

The caliper has been designed as a component compatible with the standard braking system of Mini F55/F56 models, ensuring appropriately selected braking force on the rear axle. The design provides stable pad guidance and even pressure distribution on the friction surface, which limits the risk of overheating and uneven wear.

Key functional features include:

• dedicated placement on the rear left side of the vehicle,
• preservation of factory mounting geometry and connection points,
• adaptation for use with standard brake discs and pads,
• possibility of use in the standard service process without modifying the system.

Thanks to these properties, the caliper will work well both for typical replacement of a worn component and for restoring full braking system efficiency after body and mechanical repairs.

Benefits of using an original BMW caliper

Choosing an original brake caliper for the Mini F55/F56 allows for maintaining the consistency of the entire system's operating parameters. Factory fitment minimizes the risk of problems with bleeding, uneven braking, or accelerated pad wear. A used OEM component is a compromise between quality and cost, especially important when repairing vehicles used on a daily basis.

The most important advantages of such a solution include:

• consistency with the factory design assumptions of the braking system,
• easier diagnostics and service compared to replacements of uncertain origin,
• the ability to use existing BMW service documentation during installation and adjustment.

The used condition allows for the economical restoration of system efficiency while maintaining predictable vehicle behavior during braking in various road conditions.

Selection support and additional materials

The component has assigned interchangeable numbers, which facilitates verification of compatibility with a specific vehicle configuration and comparison with parts already installed in the car. In case of doubt, it is worth comparing the markings with service documentation or seeking advice from a technical consultant to select a caliper that exactly matches the given version of the Mini F55/F56.

If you want to deepen your knowledge on the safe selection of used braking system components, practical tips can be found in the article Second-hand braking system: how to safely choose discs, calipers, and ABS?, where the most important aspects of checking and selecting such components are discussed step by step.

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 calipers, carriers, or mounting brackets, check the available parts in the BMW brake calipers and brackets category.