Mercedes W203 C209 Brake Servo Master Cylinder Braking Booster A0054305030

Mercedes W203 C209 Brake Servo Master Cylinder Braking Booster is an original brake servo integrated with the master cylinder, designed for the braking system of C-Class and CLK models. This component from the Brake servos and pressure regulators group ensures stable conversion of pedal force into system pressure, which translates into predictable, safe braking during daily operation.

Specifications and technical data

• SKU: rhd-A0054305030
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0054305030
• Substitutable numbers: A0054305030, A 005 430 50 30, A0054309701, A 005 430 97 01, A2034300002, A 203 430 00 02, BG
• Category: Brake Servos

Purpose and function in the braking system

The presented brake servo with master cylinder has been designed specifically for Mercedes W203 and C209 series vehicles, where it is responsible for effective assistance of the brake pedal pressure. Thanks to its vacuum design, it amplifies the driver's force, stabilizes pressure in the circuits, and helps maintain consistent braking characteristics at various speeds and vehicle loads.

As an OEM component of the braking system, the servo integrated with the master cylinder works with factory lines, calipers, and regulators, which facilitates installation and reduces the risk of compatibility issues.

Benefits of using an original brake servo

Using an original servo–master cylinder assembly in a Mercedes W203 or C209 allows you to maintain the factory characteristics of the braking system. In practice, this means:

• more predictable brake pedal response,
• properly selected boost ratio,
• consistent operation with vehicle safety systems (ABS, ESP),
• easier diagnostics and service compared to low-quality replacements.

For the user, this translates into comfortable, repeatable pedal operation and stable brake feel, which is especially important for city driving and long-distance travel.

Condition, origin, and application of the servo

The offered component comes from dismantling and is used, which allows for cost-effective repair of the braking system while maintaining the manufacturer's original specifications. This type of part is particularly recommended in case of:

• decreased braking efficiency resulting from servo problems,
• a hard or non-linear brake pedal,
• the need to replace the complete servo–cylinder assembly instead of repairing individual sub-assemblies.

Thanks to the preservation of factory geometry and mounting points, installation in place of a worn-out element is simple for an experienced mechanic and does not require structural modifications.

Selection and compatibility with part numbers

To correctly select a brake servo for a specific version of the Mercedes W203 or C209, it is worth using the OEM part number and available interchangeable numbers. The product has assigned identifiers in the catalog system, which facilitates verification of compatibility with the number factory-installed in the vehicle. In case of doubt, consultation with a mechanic or comparing markings on the dismantled sub-assembly is recommended.

Braking system expansion and related parts

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

For the full effect of the upgrade, it is also worth ensuring the efficiency of other systems affecting safety and driving comfort, such as cabin heating and air conditioning. 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.

Summary

Mercedes W203 C209 Brake Servo Master Cylinder Braking Booster is a functional, original servo–master cylinder assembly that allows you to restore the proper operation of the braking system while maintaining factory parameters. Choosing a used OEM element is a reasonable solution for drivers who value technical consistency, predictable vehicle behavior, and a favorable ratio of repair cost to the quality of the parts used.