Brake Servo BMW F45 F46 B47 B48 Booster Unit Master Cylinder 6854645

Brake Servo BMW F45 F46 B47 B48 Booster Unit Master Cylinder is an original component from the Brake servos and pressure regulators group, designed for the braking systems of BMW F45 and F46 series with B47 and B48 engines. This used OEM part ensures factory-spec fitment for both hydraulic and vacuum systems, resulting in predictable brake pedal operation and stable servo assistance during daily use.

Specifications and technical data

• SKU: 6868995
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6868995
• Substitutable numbers: 6868995, 34336868995, 6854645, 6866164, 34336866164, 6868997, 34336868997
• Category: Brake Servos

Purpose and function in the BMW braking system

The presented brake servo and master cylinder unit is designed as an integral part of the BMW F45 and F46 braking system, compatible with B47 and B48 engines. It is responsible for generating and transmitting hydraulic pressure to the brake circuits, while the integrated servo assists the driver by reducing the force required to depress the pedal. This enables a repeatable, predictable vehicle response to every brake application, which is crucial for safety and driving comfort.

Advantages of using an original servo and master cylinder

The original brake servo and master cylinder for BMW provides:

• factory-spec fitment for F45 and F46 models with B47/B48 engines,
• consistent performance parameters with other system components,
• preservation of the brake pedal characteristics intended by the manufacturer,
• the ability to utilize existing line architecture and mounting points without modifications.

By using an OEM part, the braking system retains its original characteristics, and the driver receives stable and predictable braking assistance across the full range of operating loads.

Compatibility and replacement numbers

The brake servo and master cylinder belong to a group of components for which the manufacturer has provided various catalog numbers and interchangeable part numbers. This facilitates the selection of the correct variant for a specific BMW F45 or F46 configuration, taking into account the B47/B48 engine version and equipment specifications. In the technical specification description, you will find both the OEM part number and associated reference numbers, allowing for precise verification of compatibility with your vehicle.

Condition, origin, and installation aspects

The offered brake servo and master cylinder is a used BMW component, meaning it comes from vehicle dismantling and retains the manufacturer's original design. This type of component is particularly attractive for users seeking factory solutions on a reasonable budget, while maintaining compliance with the vehicle's safety system. Installation is performed in the factory location, using the mounting points and hydraulic/vacuum connections provided by the manufacturer.

How to select the correct brake servo and master cylinder for BMW F45/F46

To correctly select this component for your BMW, it is worth paying attention to:

• the exact vehicle model (F45 or F46),
• the type of engine used (B47 or B48),
• the compatibility of the OEM part number and interchangeable numbers with the vehicle specification,
• the braking system configuration (e.g., type of calipers and discs used).

This approach minimizes the risk of incorrect selection and allows for full functionality of the braking system after replacement.

Expansion and service of the BMW braking zone

If you are planning a comprehensive repair or upgrade of the braking zone in your BMW and need other elements from the same group, such as servos, pressure regulators, or related assistance modules, check the available parts in the BMW brake servos and pressure regulators category.

When planning service work within the braking system and related comfort systems, it is also worth ensuring the efficiency of systems responsible for the working conditions of the driver and passengers. Practical tips on selecting used OEM components, service schedules, and checking elements affecting driving comfort can be found in the article: Air conditioning and heating – part selection and maintenance for year-round comfort.