BMW F20 F21 F22 F30 F31 Brake Servo Unit Master Cylinder 6798423

BMW F20 F21 F22 F30 F31 Brake Servo Unit Master Cylinder is an original brake system component from the Brake Master Cylinders group, designed for BMW F-series models. It ensures stable, predictable brake assistance, which translates into safe and comfortable vehicle handling. This used OEM component is a sensible choice for professional repairs when you prioritize factory fitment and the proper operation of the entire system.

Specifications and technical data

• SKU: 6798423-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6798423
• Substitutable numbers: 34336851099, 6851099, 34336851096, 6851096, 34337851569, 7851569, 34336796531, 6796531, 34337852160, 7852160, 6798423
• Category: Master Cylinders

Purpose and function of the brake servo

The brake servo in BMW F-series models is responsible for effectively assisting the pressure applied to the brake pedal, allowing the driver to gain significantly better control over the vehicle with less effort. The component works in conjunction with the brake master cylinder and other system parts, stabilizing operating pressure and ensuring consistent braking characteristics under various operating conditions.

When replacing the servo, it is crucial to use a part with the correct specifications for the specific generation of BMW F20, F21, F22, F30, and F31 to maintain proper system performance and avoid issues with brake force modulation or braking distance.

Benefits of using an original BMW servo

Using an original brake servo from the Brake Master Cylinders group allows you to maintain the factory configuration of the braking system without the need for vehicle modifications. Proper fitment to the engine bay geometry and the stock brake master cylinder reduces the risk of leaks, incorrect pedal travel, or inconsistent assistance performance.

A used OEM component is also a cost-effective solution while maintaining a high level of safety. This type of servo is designed for long-term operation, and its reuse in good technical condition allows for restoring proper brake system performance without compromising compatibility.

Part selection and compatibility

The brake servo used in this reference has a dedicated part number and associated interchangeable numbers, which facilitates precise component identification. When selecting a part for a specific BMW vehicle, it is worth using the OEM number or reference numbers to avoid installing a component with different operating characteristics.

In practice, this means the ability to directly replace a worn servo with a compatible equivalent without the need for installation modifications or changing accessories. This selection method is particularly important when working with vehicles equipped with advanced safety systems, where stable and predictable brake system operation is of key importance.

Condition, installation, and application of the servo

The offered brake servo is in Used condition, meaning it has been removed from a vehicle and was previously in operation. This type of part is a good choice for repairs where the priority is to maintain the original system specification while optimizing costs. Before installation, a standard verification of tightness and the correct operation of the diaphragm and assistance mechanism is recommended.

Professional installation of the servo should include proper bleeding of the brake system and checking the interaction with the brake master cylinder and the brake pedal. This makes it possible to restore the stock operating characteristics of the system, without unwanted effects such as a pedal that is too soft or too hard.

Expanding the BMW brake system

If you are planning a comprehensive repair or upgrade of the braking area in your BMW and need other elements from the same group, such as additional pumps, assistance modules, or control elements, check the available parts in the BMW Brake Master Cylinders category.

During service work, it is also worth taking care of other vehicle systems, including proper engine fuel supply. Detailed information on diagnostics, selection by OEM numbers, and maintenance of fuel supply components can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which helps organize technical knowledge and facilitates the planning of further repairs.