Mercedes X250d W470 Brake Servo Booster Master Cylinder Braking Unit A4704312300

Mercedes X250d W470 Brake Servo Booster Master Cylinder Braking Unit is a factory servo unit integrated with the brake master cylinder, designed for the braking system in the X-Class model. It offers precise braking force modulation, stable system operation, and maintains the factory pedal feel, which is crucial for safety and driving comfort. As an original Mercedes brand component from the Brake Servos and Pressure Regulators category, it is the right choice for professional repairs or restoring the vehicle's factory configuration.

Specifications and technical data

• SKU: RHD-A4704312300
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A4704312300
• Substitutable numbers: A4704312300, A 470 431 23 00
• Category: Brake Servos

Purpose and function in the braking system

The described brake servo unit with master cylinder is a key component of the hydraulic braking system in the Mercedes X250d W470. It is responsible for:

• amplifying the driver's force applied to the brake pedal,
• converting mechanical force into hydraulic pressure in the lines,
• maintaining a stable, predictable pedal travel under various load conditions.

Thanks to the use of the original Mercedes design, compatibility with the factory ABS/ESP system and other hydraulic brake components is maintained.

Benefits of using an original brake servo

Using an original servo unit with a master cylinder in the Mercedes X250d W470 provides a number of practical operational benefits:

• Factory fit – proper geometry of mounts and connections allows for installation without structural modifications.
• Consistent braking characteristics – maintaining the manufacturer-intended boost force and pedal travel.
• Vehicle electronics compatibility – correct operation with stability control and traction control systems.
• Reduced risk of leaks – perfectly matched connections with brake lines and the vacuum system.

For workshops and users, this means more predictable installation and a lower risk of issues after repairing the braking system.

Characteristics of the used component

The offered unit comes from dismantling and is a used part, which allows for reducing repair costs while maintaining the original manufacturer's specifications. This type of solution is often chosen in cases of:

• brake booster failure (hard pedal, lack of assistance),
• mechanical damage to the servo or master cylinder,
• the need for a quick replacement with a factory-designed component.

Choosing a used, original component is a reasonable alternative to replacements of unknown origin, especially in commercial vehicles where consistent performance and predictable service are essential.

Professional use in service and repairs

The Mercedes X250d W470 brake servo unit with master cylinder is suitable for both independent workshops and services specializing in the Mercedes brand. It enables:

• comprehensive replacement of the brake booster assembly in a single installation process,
• reduced vehicle downtime thanks to the perfect fit to factory mounts,
• maintaining compliance with the manufacturer's service documentation.

For fleets and users intensively operating the X-Class, this means more predictable maintenance costs and maintaining the proper level of braking system safety.

Related Mercedes braking system components

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 pumps, regulators, or additional booster modules, check the available parts in the Mercedes Brake Servos and Pressure Regulators category.

More about selecting used components

When working with vehicle systems – both braking and those responsible for driving comfort – it is worth knowing the best practices for selecting used OEM components and the principles of their maintenance. Practical tips, procedures, and examples can be found in the article Air conditioning and heating – part selection and maintenance for year-round comfort, which discusses, among other things, the approach to used components in modern cars.