Ford Focus Mk3 Brake Servo Master Cylinder Reservoir DV61-2140-J

Ford Focus Mk3 Brake Servo Master Cylinder Reservoir is a complete assembly consisting of a brake servo, master cylinder, and reservoir, designed for the braking system of the third-generation Ford Focus. This component belongs to the Brake master cylinders group and serves as a functional base for restoring proper brake hydraulics, ensuring stable pressure and predictable brake pedal operation.

Specifications and technical data

• SKU: RHD-DV61-2140-J
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: DV61-2140-J
• Substitutable numbers: DV61-2140-J, DV612140J, 2640186, KV6C2140CA, KV6C-2140-CA
• Part type: Master Cylinder with Reservoir
• Category: Master Cylinders

Application and function in the braking system

The presented assembly of the servo, master cylinder, and brake fluid reservoir is responsible for generating and assisting operating pressure in the Ford Focus Mk3 braking system. The servo uses vacuum to reduce the force required on the pedal, while the master cylinder distributes pressure to the wheel circuits, and the reservoir ensures an adequate supply of fluid and stable venting. As a result, the driver receives predictable brake response, even braking force distribution, and better vehicle control in daily use.

Compatibility and identification by part numbers

The component was designed as part of the original brake system architecture of the third-generation Ford Focus, which facilitates fitting to specific body and engine versions. The assembly has a dedicated OEM part number and associated interchangeable numbers, which allows for precise identification via manufacturer catalogs, service documentation, or VIN inquiries. This helps reduce the risk of selecting an incorrect variant and avoids installation issues.

Installation characteristics

The servo–master cylinder–reservoir assembly is intended for installation in the engine bay, in the factory location, using original mounting points and standard hydraulic and vacuum connections. The design is intended to work with the stock brake pedal and factory lines, which facilitates integration with the existing system. In practice, this means the replacement can be performed using standard workshop procedures, without the need for vehicle system modifications.

Benefits of using the original assembly

Using a complete servo, master cylinder, and reservoir assembly instead of a worn-out component allows for the restoration of proper braking system operating parameters, including a stable pedal engagement point and repeatable braking force. The original design ensures proper fitment to the engine bay geometry, compatibility with vehicle electronics, and the preservation of factory assistance characteristics. This solution is particularly beneficial for comprehensive brake system repairs when consistency of components and predictable vehicle behavior are required.

Brand and build quality

The product is associated with the BMW brand in the store's catalog structure, which facilitates filtering and searching within the manufacturer's range. At the same time, the assembly's design meets the standards used in modern braking systems, with an emphasis on durability, resistance to temperature changes, and stability of operating parameters over a long period of use. This solution is intended for users who expect predictable performance and compliance with the vehicle manufacturer's specifications.

Condition and operation

The item comes from dismantling and is marked as used, making it an attractive cost-effective alternative to new components while maintaining the functionality required for daily driving. Before installation, a standard service procedure is recommended: checking connections for leaks, verifying the condition of the brake fluid, proper system bleeding, and adaptation to the specific vehicle configuration in accordance with the manufacturer's recommendations.

Integration with other system components

Replacing the servo–master cylinder–reservoir assembly often involves checking other brake system components, such as lines, calipers, discs, and pads. A consistent service approach helps reduce the risk of uneven braking, air in the system, or excessive wear of individual components. In case of doubts regarding part selection or installation procedures, it is worth consulting a specialized workshop or the vehicle manufacturer's technical documentation.

If you are planning a comprehensive repair or upgrade of the braking zone in your BMW and need other components from the same group, such as servos, master cylinders, or fluid reservoirs, check the available parts in the BMW Brake master cylinders category.

For users who want to better understand the relationships between the braking system and engine power supply, as well as component selection by catalog numbers, an article describing the diagnostics and selection of fuel supply components may be helpful – you can find it here: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

If you want to maximize the potential of dismantled parts and ensure their long-term, trouble-free operation, it is worth reading the practical tips on maintenance and operation described in the guide: How to extend the life of used car parts?.