Mercedes-Benz Sprinter W906 Brake Booster Servo Master Cylinder A9064300308

Mercedes-Benz Sprinter W906 Brake Booster with Servo and Brake Master Cylinder is an original brake system component designed for Sprinter W906 models. The kit combines the servo and master cylinder in a single housing, ensuring stable operating pressure and predictable brake pedal response in daily use. This is an OEM solution that allows you to restore factory brake system performance without compromise.

Specifications and technical data

• SKU: rhd-A0004311927
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0004311927
• Substitutable numbers: A9064300308, A 906 430 03 08, A0004311927, A 000 431 19 27, A0004317601, A 000 431 76 01, A 002 431 49 02, A0024314902, KZ
• Category: Brake Servos

Purpose and Role in the Braking System

The presented servo and brake master cylinder assembly is specifically designed for Mercedes-Benz Sprinter W906 generation commercial vehicles. As a component of the servos and brake force regulators category, it is responsible for amplifying the force applied to the pedal and ensuring proper pressure distribution to the brake circuits. This provides the driver with consistent, predictable braking while maintaining appropriate force modulation.

Combining the servo and master cylinder into a single unit reduces the number of hydraulic connections, which helps maintain system integrity and simplifies diagnostics. Using an original Mercedes part ensures compliance with factory service documentation and manufacturer procedures.

Construction of the Servo + Master Cylinder Assembly

The brake booster in this configuration uses vacuum to increase the force transmitted from the pedal to the brake master cylinder piston. The assembly includes:

• a servo housing with a diaphragm responsible for amplifying braking force,
• an integrated master cylinder that generates pressure in the brake circuits,
• a mechanical connection to the brake pedal ensuring a linear operating characteristic.

This design allows for maintaining appropriate system rigidity, which translates to a clear pedal feel and better vehicle control, especially under the full load typical for commercial vehicles.

Benefits of Using an Original Assembly

Using a complete, original servo + master cylinder assembly in the Sprinter W906 offers several practical benefits:

• Compatibility with the Factory System – precise fit for engine bay geometry, mounting points, and brake lines.
• Consistent Braking Characteristics – maintaining the parameters intended by the vehicle manufacturer.
• Reduced Risk of Leaks – fewer connections and intermediate components compared to mixed sets.
• Simplified Diagnostics – ability to use service procedures and technical data intended for OEM parts.

This solution is particularly beneficial for fleets, workshops specializing in the Mercedes brand, and users who expect consistent vehicle behavior after brake system repairs.

Condition, Origin, and Practical Application

This component comes from the original Mercedes-Benz production line and is designated as an OEM part, which facilitates identification in service catalogs and selection for specific Sprinter W906 body variants and powertrains. As a used part, it is intended for users seeking a reasonable compromise between cost and quality, while maintaining the original manufacturer's specifications.

Before installation, the standard workshop procedure is recommended: checking system integrity, bleeding the brake circuits, and verifying pedal operation under load. A correctly selected and installed servo and brake master cylinder assembly restores stable braking, which is crucial for the safety of a commercial vehicle operating in urban traffic and on longer routes.

Operation and Selection of Used Parts

When selecting used brake system components, it is important to pay attention to compliance with service documentation, manufacturer markings, and vehicle type. Guidelines for working with OEM components, described in more detail in the article on selecting and maintaining components for vehicle comfort and safety, can be helpful, covering service procedures and practical comparison tables.

To maximize the potential of salvaged parts, it is advisable to follow recommendations for their further operation and periodic inspection. Practical tips in this regard can be found in the material how to effectively extend the lifespan of used car parts, which describes proven methods for maintaining and diagnosing mechanical and hydraulic components.