Ford Focus MK2 Brake Booster Servo Master Cylinder Unit 3M51-2B195-CF

Ford Focus MK2 Brake Booster Servo Master Cylinder Unit integrated with the master brake cylinder is a component from the Brake servos and pressure regulators group, designed specifically for the Ford braking system. The original Ford design ensures stable transmission of brake pedal force to the system pressure, which translates into predictable, safe, and comfortable braking in everyday use.

Specifications and technical data

• SKU: RHD-3M51-2B195-CF
• Mark: Ford
• Condition: Used
• OEM Part Number: 3M51-28195-CF
• Substitutable numbers: 3M51-2B195-CF, 3M512B195CF, 1477814, 1689822, 6M512005BB, 6M51-2005-BB, 6M512005DC, 6M51-2005-DC
• Part type: Brake Servo & Master Cylinder
• Category: Brake Servos

Purpose and function in the braking system

The presented brake booster and master cylinder unit is dedicated to the second-generation Ford Focus and is responsible for amplifying the pressure force on the brake pedal and precisely metering the pressure in the brake circuits. Combining the booster with the master cylinder in one unit reduces the number of connections, which promotes operational stability and facilitates the diagnosis of potential leaks.

This element works with the vacuum booster system, allowing the driver to achieve significantly lower pedal resistance while maintaining an appropriately short braking distance. This solution is particularly beneficial in city traffic and during emergency maneuvers, where quick reaction and repeatability of brake performance are crucial.

Construction and design advantages

The brake booster in this assembly has been designed as a factory Ford component, which guarantees compatibility with mounting geometry, pushrod length, and pedal operating characteristics. The integrated master brake cylinder ensures proper pressure distribution between circuits, which is key to vehicle stability during heavy braking.

The main design advantages include:

• dedicated fitment to the pedal column and bulkhead of the Ford Focus MK2,
• consistency with the factory brake line system,
• booster characteristics tailored to the weight and load distribution of this model.

Thanks to this, installation is straightforward, without the need for modifications or adaptations of universal parts.

Benefits of using the original booster unit

Using the original brake booster and master cylinder unit in a Ford Focus MK2 allows for maintaining factory braking performance parameters. Compared to aftermarket replacements with universal characteristics, the original component better replicates linear pedal response, which makes it easier to feel the grip limit and improves vehicle control.

Practical benefits include, among others:

• more reliable brake force metering across the full speed range,
• consistent cooperation with safety systems (ABS, ESP – if present in the car's configuration),
• reduced risk of incorrect pedal travel after replacement.

For workshops and users, this means fewer corrections after installation and predictable vehicle behavior after repairing the braking system.

Condition, fitment, and identification

The offered brake booster and master cylinder unit is a used component, sourced from dismantling, which allows for economical repair while maintaining the original Ford specification. Before installation, it is recommended to perform a standard check of the system's tightness, the condition of the lines, and bleeding according to the service procedure for the specific model.

The unit has a factory OEM part number and associated interchangeable numbers, which facilitates clear identification and selection for a specific version of the Ford Focus MK2. In case of doubt, it is worth comparing the markings with the vehicle documentation or consulting a mechanic to confirm full compatibility.

Expansion and service of the Ford braking zone

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

When performing service work on the braking system and components interacting with the powertrain, it is also worth ensuring the efficiency of systems responsible for driving comfort and safety. Practical tips on selecting used OEM components and maintenance schedules can be found in the article "Air conditioning and heating – part selection and maintenance for year-round comfort", which helps organize the car's service plan throughout the year.