Brake Servo Unit BMW F20 F21 F22 F30 F31 M Sport Brake Master Cylinder 6798425

Description

The Brake Servo Unit BMW F20 F21 F22 F30 F31 M Sport with integrated brake master cylinder is an original BMW braking system component, designed for precise integration with the factory M Sport system. Thanks to its OEM construction, it ensures stable braking force modulation and predictable pedal response, contributing to safe and comfortable driving. This solution is intended for users who wish to maintain the factory braking characteristics in their F-series models.

Specifications and technical data

• SKU: rhd-6798425-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6798425
• Substitutable numbers: 34336851096 34336851098 34337851569, 6798425, 6851096 6851098 7851569, 34336796531 34337852160, 6796531 7852160, PK
• Category: Brake Servos

Application and Compatibility with BMW F-Series

The Brake Servo Unit BMW F20 F21 F22 F30 F31 M Sport Brake Master Cylinder is a braking system component used in compact and mid-size BMW F-series models with the M Sport package. It is designed to work with factory calipers and discs to maintain appropriate servo assistance and linear pedal pressure response.

Its original origin from the BMW group ensures correct geometry, mounting points, and operating parameters, which is particularly important for vehicles equipped with a sport braking system. Replacing a worn servo with this unit restores the factory brake pedal feel without requiring installation modifications.

Brake Servo and Master Cylinder Construction

The presented servo, integrated with the brake master cylinder, belongs to the category of brake servos and force regulators, responsible for the proper transfer of force from the pedal to the pressure in the hydraulic system. The vacuum-assisted design ensures:

• noticeable reduction in pedal effort during everyday city driving,
• more precise braking force modulation during dynamic driving,
• stable operating pressure in the brake circuits.

Combining the servo and master cylinder into a single unit reduces the number of connections and potential leaks, while also simplifying system servicing and diagnostics.

Benefits of Using an Original BMW Component

Choosing an original brake servo unit with a master cylinder for BMW F-series offers a range of practical benefits:

• Factory Fitment – maintains original mounting points and system geometry, eliminating the need for modifications.
• Consistent M Sport Characteristics – appropriately calibrated ratio and assistance, in line with the sport package’s design.
• Vehicle Electronics Compatibility – proper cooperation with safety systems such as ABS and stability control.
• Reference Number Selection – facilitates part matching to specific body and engine variants.

A component from this range is particularly recommended when replacing a worn or damaged servo, where maintaining original braking performance without experimenting with aftermarket alternatives is a priority.

Condition, Verification, and Preparation for Installation

The offered BMW brake servo unit is from the secondary market and is designated as used. Before being offered for sale, it undergoes visual inspection and verification for leaks and housing integrity, allowing for an assessment of its suitability for further use. This type of part is a good choice for users looking to optimize repair costs while maintaining the original braking system specifications.

During installation, it is recommended to use a workshop experienced in BMW servicing to ensure proper system bleeding, pedal position adjustment, and verification of cooperation with the vehicle’s electronic systems.

How to Select the Correct BMW Brake Servo

To correctly select this servo model for your vehicle, pay attention to:

• compatibility with the F-series body generation,
• the presence of the M Sport package and the corresponding braking system,
• reference numbers assigned to the specific vehicle configuration.

If you have any doubts during selection, specialized guides on the operation and servicing of components in premium cars may be helpful. For comprehensive vehicle maintenance, including other systems, it is worth reviewing the material: how to select used OEM components for air conditioning and heating and plan their maintenance, which demonstrates best practices when working with original parts.

Summary

The Brake Servo Unit BMW F20 F21 F22 F30 F31 M Sport with brake master cylinder is an original, used braking system component designed for BMW F-series models equipped with the sport braking package. It ensures the preservation of factory servo characteristics, consistency with safety systems, and proper braking force modulation. It is a sensible choice for drivers who expect adherence to the manufacturer’s design and wish to restore predictable, confident braking performance to their BMW.