Mercedes W221 Brake Servo Booster Master Cylinder Module Tank A1664300201

Mercedes W221 Brake Servo Booster Master Cylinder Module Tank is an original brake system component from the Brake servos and force regulators category, designed for high-end Mercedes models. Integrating the master cylinder with the fluid reservoir and servo ensures consistent hydraulic and power-assist performance, which translates into stable, predictable, and safe braking. This used OEM component is a sensible choice for professional repairs when you prioritize factory fitment and maintaining the original operating characteristics of the system.

Specifications and technical data

• SKU: A2214300030
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2214300030
• Substitutable numbers: A2214300030, A 221 430 00 30
• Category: Brake Servos

Purpose and function in the brake system

The master cylinder with an integrated servo is responsible for generating and assisting pressure in the brake system, which directly affects braking efficiency and pedal feel. In Mercedes W221 models, using a complete assembly with the master cylinder, fluid reservoir, and servo allows for maintaining the structural consistency of the system and the correct braking force characteristics intended by the manufacturer.

An original brake assembly of this type is particularly important in premium class vehicles, where the brake system interacts with advanced vehicle electronics, electronic stability control systems, and comprehensive safety systems. Using a factory solution minimizes the risk of compatibility issues and facilitates future diagnostics.

Benefits of using an original brake servo and force regulator

Choosing an OEM component from the Brake servos and force regulators category for a Mercedes offers a number of practical advantages:

• factory fitment for the brake system of a specific vehicle generation,
• preservation of the manufacturer-intended power-assist and braking force characteristics,
• consistent operation with ABS, ESP, and other safety systems,
• reduction of the risk of improper brake pedal operation after installation,
• easier configuration and service in professional workshops.

A used OEM element is a compromise between cost and quality – it allows you to maintain high safety and comfort standards while reducing expenses compared to a new part.

Condition, verification, and preparation for installation

The presented master cylinder with fluid reservoir and servo comes from dismantling, which means it is a used component, but verified for its suitability for further operation. This type of part is particularly attractive for workshops specializing in the Mercedes brand and for conscious users who are looking for factory solutions at a reasonable price.

Before installation, standard service procedures are recommended: checking for leaks, replacing the brake fluid, thorough bleeding of the system, and checking the correct operation of the brake pedal during a test drive. A properly installed assembly ensures stable system pressure and a predictable vehicle response to pedal input.

Professional application and operational tips

Due to the importance of the brake system for safety, the installation of such a component should be entrusted to a specialized service center or a mechanic with experience in working with Mercedes vehicles. Proper bleeding, checking line tightness, and verifying interaction with vehicle electronics are crucial for trouble-free operation.

To extend the service life of a used pump and servo assembly, it is worth using high-quality brake fluid, regularly checking its level, and responding to any changes in pedal operation (soft pedal, increased braking distance, unusual noises). Additional practical tips regarding the operation of components from dismantling can be found in the article: How to extend the service life of used car parts?.

Expanding the brake system in a Mercedes

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 force regulators, or related power-assist modules, check the available parts in the Mercedes brake servos and force regulators category.

Selecting components from the same product group of the same brand allows you to maintain consistent system operation, facilitates diagnostics, and reduces the risk of compatibility issues in the future. This is particularly important in premium class vehicles, where the brake system is closely integrated with electronics and safety systems.