Mercedes-Benz Vito W639 Servo Brake Fluid Reservoir Bottle A6394300102

Description

Mercedes-Benz Vito W639 Servo Brake Fluid Reservoir Bottle is an original brake system component designed to work with the brake servo in this model. Thanks to its factory origin from the Mercedes range, it ensures a proper fit to the vehicle’s construction and stable operating parameters of the brake system. It is a practical solution for users looking for a proven, OEM-compliant reservoir for the Vito W639 servo.

Specifications and technical data

• SKU: rhd-A6394300102
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6394300102
• Substitutable numbers: A6394300102, A 639 430 01 02, EM
• Category: Brake Servos

Purpose and function in the brake system

The presented reservoir is a component that works with the brake servo in the Mercedes Vito W639, belonging to the Brake Servos and Proportioning Valves group. It is responsible for storing brake fluid and supplying it steadily to the master cylinder and other system components. A properly selected reservoir reduces the risk of air entering the system, facilitates bleeding, and helps maintain constant operating pressure during braking.

Compatibility and OEM fitment

The original origin from the Mercedes line means that the reservoir has been designed for specific mountings, connector diameters, and the geometry of the Vito W639 engine bay. Thanks to this:

• it fits the factory brake servo brackets,
• it ensures proper routing of brake fluid lines and hoses,
• it maintains the correct fluid level within the range specified by the manufacturer.

Such fitment reduces the need for modifications and allows for maintaining the factory configuration of the brake system, which is particularly important when servicing commercial vehicles.

Characteristics of the used component

The element comes from the secondary market, which allows for economical brake system repair while maintaining the manufacturer’s original specifications. A used brake servo reservoir is a good choice wherever the following are important:

• maintaining the factory brake system design,
• reducing repair costs while using OEM parts,
• the ability to quickly replace a worn or damaged reservoir without modifying the installation.

Choosing an original, used component is often preferred by workshops specializing in Mercedes service, as it facilitates diagnostics and subsequent system maintenance.

Service, safety, and part selection

A functional brake servo reservoir is important for the stability of the entire system – it enables fluid level monitoring, and its design is adapted to the pressures and temperatures occurring during vehicle operation. When replacing, it is worth paying attention to:

• compatibility with the specific version of the Vito W639,
• the condition of the connection ports and sockets,
• the absence of leaks and the ability to properly mount it on the servo.

For users who want to better plan vehicle maintenance and learn the principles of selecting used OEM components, the guide on our blog may be helpful: Air conditioning and heating – part selection and maintenance for year-round comfort, which describes practical service procedures and rules for choosing components from the secondary market.

Expanding the brake system in the Mercedes Vito

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 servos, brake proportioning valves, or related components, check the available parts in the Mercedes Brake Servos and Proportioning Valves category.

Summary

Mercedes-Benz Vito W639 Servo Brake Fluid Reservoir Bottle is a practical solution for owners and workshops that want to restore the proper operation of the brake system using an original component. Proper fitment to the servo, compatibility with the Vito W639 design, and the possibility of economical replacement make it a sensible choice for repairs and inspections of the brake system in this model.