Mercedes W212 Brake Servo Booster Master Cylinder Unit A2124302330

Mercedes W212 Brake Booster – Servo, Booster, and Brake Master Cylinder is an original assembly from the Brake Boosters and Force Correctors group, designed for the braking system of E-Class W212 models. The complete servo module with the brake master cylinder ensures stable system pressure, predictable pedal response, and safe braking force modulation in daily operation.

Specifications and technical data

• SKU: rhd-A2124302330
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2124302330
• Substitutable numbers: A2124302330, A 212 430 23 30
• Category: Brake Servos

Purpose and Function in the Braking System

This brake booster and master cylinder assembly is responsible for assisting the force applied to the brake pedal and precisely generating working pressure in the brake circuits. Combining a vacuum servo with a master cylinder in a single unit reduces pressure losses, improves operational repeatability, and simplifies diagnostics of the entire system.

The component is factory-designed to the specifications of Mercedes E-Class W212 models, thus maintaining the correct pedal travel characteristics, proportioning between circuits, and compatibility with the factory braking system electronics.

Benefits of Using an Original Servo Assembly

Using an original servo-booster-brake master cylinder assembly in a Mercedes W212 allows for braking parameters to be maintained in accordance with the manufacturer's design. In practice, this means:

• a stable brake pedal engagement point, without a "spongy" feel,
• repeatable braking force with subsequent pedal applications,
• proper cooperation with safety systems (ABS, ESP, brake assist),
• maintenance of the factory braking force distribution characteristics between axles.

For the user, this translates to confident vehicle control, predictable responses in emergency situations, and a reduced risk of uneven wear of friction components in the braking system.

Technical Characteristics and Installation

The servo unit with the brake master cylinder is structurally prepared for installation at the factory mounting points in the vehicle's bulkhead. The assembly works with the engine's vacuum system and the existing brake line installation, allowing for hassle-free replacement of a worn component without the need for structural modifications.

The product comes from the line of original Mercedes components and is classified in the Brake Boosters and Force Correctors group, which facilitates selection based on service documentation and manufacturer catalogs. The used condition indicates that the component has been previously operated but retains functionality allowing for further use after proper installation and bleeding of the system.

Selection, Compatibility, and Technical Support

When selecting this assembly for a specific version of the Mercedes E-Class W212, it is crucial to compare catalog data and markings with the vehicle's documentation. The assembly has an assigned OEM part number and associated interchangeable numbers, enabling precise identification in service systems and minimizing the risk of selecting an incorrect variant.

If you are planning a comprehensive repair or upgrade of the braking area in your Mercedes and need other parts from the same group, such as servos, brake force correctors, or complete booster modules, check the available parts in the Mercedes Brake Boosters and Force Correctors category.

For users who are simultaneously servicing other vehicle systems, practical tips on operation and selection of used components may also be useful. In the context of maintaining year-round driving comfort, it is worth familiarizing yourself with the guide Air Conditioning and Heating – Part Selection and Maintenance for Year-Round Comfort, which discusses the principles of working with original components and service schedules.