BMW F20 F21 F30 F31 Rear Axle Brake Braking Caliper Housing Right O/S 6850858

BMW F20 F21 F30 F31 Rear Axle Brake Braking Caliper Housing Right O/S is an original brake system component designed for installation on the rear axle on the passenger side. As part of the Brake Calipers and Brackets group, it ensures stable pad guidance, even pressure on the disc, and predictable vehicle behavior during braking. This is a solution for users who expect factory-fitment and consistency with the BMW brake system design.

Specifications and technical data

• SKU: 6850858-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6850858
• Substitutable numbers: 34216850858, 6850858, 34216850860, 6850860
• Location on the vehicle: Rear, Right
• Part type: Brake Caliper
• Category: Calipers & Brackets

Purpose and compatibility with BMW

The presented caliper is dedicated to BMW F-series models with rear-wheel drive or xDrive, where the brake system design requires a precisely matched caliper housing on the right side of the rear axle. The vehicle placement is factory-defined as rear – right side, which facilitates unambiguous part selection during repair or replacement of worn components. The original BMW OE origin ensures the maintenance of correct mounting geometry, appropriate guide spacing, and compatibility with stock brake discs and pads used in these models. As a result, the caliper works seamlessly with the factory brake master cylinder, lines, and assistance systems such as ABS or traction control.

Housing construction and function in the brake system

The caliper housing provides a rigid, deformation-resistant base for the mechanism that presses the pads against the disc. Properly designed guide slots and pad contact surfaces reduce the risk of uneven pad wear and vibrations during braking. The stable housing construction promotes the maintenance of a constant braking point and repeatable braking force on the rear axle. As a component mounted on the rear right side, the caliper contributes to the balance of braking force between the left and right sides of the vehicle. A correctly selected and functional housing is significant for vehicle stability during emergency braking, especially on surfaces with variable grip.

Benefits of using an original, used caliper

Choosing an original, used BMW brake caliper is a solution that allows you to combine cost control with the preservation of factory braking characteristics. Original geometry and build quality translate into proper fitment with the carrier, hub, and other system components, without the need for modifications or adjustments required by aftermarket replacements. Compared to low-quality replacements, a housing sourced from a dismantled BMW vehicle maintains material and structural compliance with the manufacturer's specifications. This is particularly important for the rear axle, where the brake system interacts with electronic stability control and brake force distribution systems.

Application in service and brake system repairs

This brake caliper is suitable both for standard replacement of a worn component and for more extensive service work involving the regeneration of the rear axle brake system. It can be used in:

• repairs following uneven wear of pads or discs on the rear right side,
• resolving issues with seized guides or pistons,
• restoring proper brake operation on one side of the axle after diagnostic testing on rollers. Thanks to the maintenance of the factory manufacturing standard, installation proceeds in a manner typical for original BMW components, which facilitates workshop operations and reduces vehicle downtime.

Technical support and part selection

To better understand how to safely use original recycled components and how to optimize service costs, it is worth consulting specialized materials. Practical tips regarding the selection of used brake system components can be found in the article Brake calipers under the microscope: How to effectively reduce brake system repair costs by choosing verified recycled parts. 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 caliper housings, carriers, or mounting brackets, check the available parts in the BMW Brake Calipers and Brackets category.