Mercedes W169 W245 OM640 Diesel Brake Vacuum Pump A6402300265

Mercedes W169 W245 OM640 Diesel Brake Vacuum Pump is an original component from the Vacuum pumps group, designed for OM640 diesel engines in A-Class W169 and B-Class W245 models. This used vacuum pump provides a functional solution for the braking system and engine accessories, ensuring stable vacuum generation in the Diesel-powered unit.

Specifications and technical data

• SKU: A6402300265
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6402300265
• Substitutable numbers: A6402300265, A 640 230 02 65, KZ
• Fuel type: Diesel
• Category: Vacuum Pumps

Purpose and function of the vacuum pump

The vacuum pump in the OM640 engine is responsible for generating the vacuum necessary for the proper operation of the brake booster and other vacuum-operated components in the diesel unit. In diesel engines, which lack a traditional vacuum source from the throttle, this component is crucial for maintaining proper brake assist force and stable operation of control systems.

Using a dedicated pump in Mercedes W169 and W245 models allows for compliance with the manufacturer's factory specifications, which translates into predictable vehicle behavior during braking and idling. A properly selected vacuum pump reduces the risk of vacuum drops, which can result in a hard brake pedal or unstable operation of accessories.

Advantages of using an original vacuum pump

Choosing an original vacuum pump for a Mercedes with an OM640 engine ensures:

• structural compatibility with the diesel power unit,
• proper fitment for mounts and vacuum line systems,
• stable operating parameters across typical engine load ranges,
• preservation of factory brake assist characteristics.

As a result, installation is straightforward, without the need for system modifications, and the vacuum system regains its proper vacuum reserves. This is particularly important in vehicles used intensively in urban traffic, where frequent braking requires efficient and repeatable servo operation.

Product characteristics and condition

The offered pump belongs to the Vacuum pumps category and comes from a Mercedes vehicle, which means it retains the original geometry, connections, and manufacturing standards specified by the manufacturer. The item is used, which in practice allows for combining factory fitment with cost-effective repair compared to a new part.

This type of vacuum pump is designed to work with the braking system and other vacuum consumers in a diesel engine, so its correct selection has a direct impact on driving safety and vehicle comfort. Replacing a worn pump with a functional OEM unit is a recommended solution in case of symptoms such as a decrease in brake assist effectiveness or errors related to the vacuum system.

Selection by part numbers and compatibility with the Diesel system

The pump was designed specifically for OM640 units, ensuring compatibility with the lubrication system, pump drive, and diesel engine operating characteristics. When selecting a part, it is worth using the OEM number and available replacement numbers to confirm compatibility with the specific vehicle equipment version and production year.

This approach minimizes the risk of installing an unsuitable component that could differ in construction details or operating parameters. In case of doubt, selecting by part number or vehicle VIN is the most precise method for identifying the correct vacuum pump.

Technical support and additional materials

To better understand the relationships between pumps, injectors, and the power supply of a diesel unit, it is worth referring to specialized materials. A practical supplement to your knowledge will be an article describing diagnostics and operation of the fuel system, available here: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

If you are interested in the impact of using original components on the future value of the vehicle, a guide on selecting used parts may also be helpful: Original used parts vs. car resale value – how not to lose money?. It allows you to make an informed decision on when it is worth choosing original dismantled components to maintain the technical integrity of the car.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional vacuum pumps, vacuum lines, or control valves, check the available parts in the Mercedes Vacuum pumps category.