Mercedes W211 CLS C219 Brake Servo Master Cylinder Booster Unit A0004300312

Description

Mercedes W211 CLS C219 Brake Servo Master Cylinder Booster Unit is a key component of the braking system, responsible for the stable transfer of pedal pressure into hydraulic pressure within the brake circuits. The offered set, coming from the Brake servos and brake force regulators group, ensures precise braking force modulation and proper cooperation with the vehicle’s factory hydraulics. This solution is intended for users expecting a proven, original design tailored to the specifics of Mercedes E-Class W211 and CLS C219 models.

Specifications and technical data

• SKU: A0004300712
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0004300712
• Substitutable numbers: A0004300712, A 000 430 07 12, A0004300312, A 000 430 03 12, A2114300302, A 211 430 03 02, 0204221045, 0 204 221 045
• Category: Brake Servos

Purpose and function in the braking system

The presented Mercedes W211 CLS C219 Brake Servo Master Cylinder Booster Unit has been designed as an integral part of the braking system for high-end Mercedes vehicles, where consistent performance and stable pedal characteristics are essential. The unit’s tasks include:

• assisting brake pedal pressure using vacuum,
• generating appropriate pressure in the hydraulic circuits,
• maintaining predictable pedal travel and linear response to input,
• cooperating with brake force distribution between the vehicle’s axles.

Thanks to this, the driver receives clear, repeatable brake feedback, which translates into safe vehicle operation in city traffic and on the highway.

Construction and design advantages

The brake servo combined with the master cylinder forms a compact unit that facilitates installation in the engine bay and reduces the number of hydraulic connections. This configuration:

• minimizes the risk of leaks at connections,
• simplifies service and potential replacement of the entire module,
• ensures consistent braking system performance parameters.

The original Mercedes design is engineered for proper body rigidity, resistance to temperature changes, and compatibility with factory brake lines and body mounts. This ensures the correct geometry of the system and the proper position of the brake pedal relative to the driver.

Benefits of using an original brake servo and force regulator

Choosing an element from the Brake servos and brake force regulators group dedicated to a specific vehicle platform allows for maintaining factory braking parameters without the need for system modifications. The most important benefits include:

• maintaining the brake pedal characteristics intended by the manufacturer,
• proper cooperation with safety systems (ABS, ESP – if present in the vehicle),
• stable pressure in the circuits during repeated braking,
• reducing the risk of uneven brake force distribution between axles.

A used element of this type is often chosen as an economical alternative to a new part, while maintaining the original design and mounting fitment.

Condition, fitment, and practical application

The offered Mercedes W211 CLS C219 Brake Servo Master Cylinder Booster Unit is a salvaged part intended for reinstallation in Mercedes E-Class W211 and CLS C219 vehicles, depending on the equipment version and the braking system used. Before purchasing, it is worth comparing the system configuration in your car with the offered solution to ensure full compatibility of mounts, hydraulic connections, and pedal geometry.

The product has an assigned OEM part number and a set of interchangeable numbers, which facilitates verification of compatibility with a specific engine version and model year. This allows for precise matching of the component to the existing system, reducing the risk of installation issues.

Braking system expansion and knowledge about used parts

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

When choosing salvaged components, it is worth knowing the principles of their proper operation and maintenance to maximize their potential. Practical tips regarding the longer and trouble-free operation of used components can be found in the article How to extend the life of used car parts?, which discusses, among other things, good installation and service practices.