Ford Focus Mk2 ST Brake Servo Booster Master Cylinder Unit 6M51-2B195-FC

Ford Focus Mk2 ST Brake Servo Booster Master Cylinder Unit is a factory-spec brake servo, brake force distributor, and master cylinder assembly designed for petrol engine versions. This OEM solution ensures proper conversion of pedal force into system pressure, stable brake operation, and consistency with the factory characteristics of the sporty ST variant.

Specifications and technical data

• SKU: RHD-6M51-2B195-FC
• Mark: Ford
• Condition: Used
• OEM Part Number: 6M51-2B195-FC
• Substitutable numbers: 6M51-2B195-FC, 6M512B195FC
• Fuel type: Petrol
• Part type: Brake Servo & Master Cylinder
• Category: Brake Servos

Purpose and function in the braking system

The complete brake servo and master cylinder assembly in the Ford Focus Mk2 ST is responsible for amplifying the pressure force on the pedal and precisely metering the pressure in the brake circuits. Thanks to the use of an OEM component, the factory pedal feel is maintained, which is important both in daily driving and during the dynamic use typical of the ST version.

The system has been designed specifically for petrol units, which means it is matched to the vacuum parameters and engine bay equipment configuration. Using the original assembly helps avoid issues with compatibility, leaks, or uneven brake force distribution.

Benefits of using the original brake servo and force distributor

Choosing the factory brake servo and master cylinder assembly for the Focus Mk2 ST provides a number of practical advantages:

• Consistent braking characteristics – maintaining the factory engagement point and pedal progression.
• Proper fit for the petrol system – correct operation with the vacuum installation and engine equipment.
• Compatibility with the factory ST braking system – no need to modify lines or mounts.
• Stable operation of the brake force distributor – predictable vehicle behavior during emergency braking.

Condition, origin, and service application

The offered item comes from dismantling and is a used OEM component, which in practice means maintaining the original design and operating parameters while optimizing repair costs. This solution is particularly beneficial for comprehensive brake system maintenance in specialized workshops dealing with Ford models and for conscious upgrades of daily-driven cars.

Due to its integrated design, the brake servo and master cylinder assembly is convenient for workshop installation – it allows for the replacement of the entire module instead of time-consuming regeneration of individual elements, which shortens vehicle downtime and facilitates leak testing of the system.

Selection and operation of used components

When selecting a used brake servo and master cylinder for the Focus Mk2 ST, it is crucial to pay attention to compatibility with the engine version (petrol) and body configuration. A properly selected component allows for maintaining safety and repeatability of brake operation, which has a direct impact on comfort and vehicle control.

If you want to better plan your brake system service in the context of other vehicle systems, it is worth checking out the guide on selecting and maintaining comfort components – you can find it in the article Air conditioning and heating – part selection and maintenance for year-round comfort, where practical principles of working with used OEM elements are discussed.

Additional tips on the proper operation of components from dismantling and ways to extend their durability are provided in the guide How to extend the service life of used car parts?, which describes, among other things, good installation and service practices.

Expanding the Ford braking system

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 discs, pads, or brake lines, check out the available parts in the category Ford Brake Servos and Force Distributors.

Such an approach allows you to build a coherent, technically correct braking system, in which the servo, brake force distributor, master cylinder, and other components work together in a predictable manner consistent with the manufacturer's specifications, which translates into safe and stable operation of the entire system.