Audi A4 B8 A5 8T Vacuum Reservoir Bottle Tank 2.0 TDI Diesel 054129808

Audi A4 B8 A5 8T Vacuum Reservoir Bottle Tank 2.0 TDI Diesel is a specialized vacuum system component designed for diesel engines, which stabilizes operating pressure for engine accessories and auxiliary systems. Thanks to its precise OEM design, the reservoir ensures consistent vacuum system operating conditions, which translates into predictable accessory performance during daily use. A used component of this type is a sensible choice when servicing 2.0 TDI units, especially when you prioritize technically correct operation at controlled costs.

Specifications and technical data

• SKU: 054129808-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 054129808
• Substitutable numbers: 054129808, 054 129 808
• Fuel type: Diesel
• Part type: Vacuum Pump
• Category: Vacuum Pumps

Purpose and role in the vacuum system

The described vacuum reservoir operates within the diesel engine system, where it is responsible for storing and stabilizing the vacuum generated by the pump. In practice, this means that the component:

• levels out vacuum fluctuations under varying engine loads,
• supports the proper operation of vacuum-controlled accessories,
• reduces the risk of system performance drops during sudden changes in RPM. For diesel units, vacuum parameter stability is particularly important, as it affects engine refinement, throttle response, and the correct operation of components working with the vacuum pump.

Compatibility with 2.0 TDI units

The reservoir has been designed for use in 2.0 TDI diesel engines installed in Audi A4 B8 and Audi A5 8T models. This ensures a perfect fit in terms of:

• mounting geometry in the engine bay,
• vacuum port diameters,
• compatibility with the factory vacuum pump and lines. Such compatibility facilitates installation and allows for maintaining the factory routing logic of the lines, which is important for maintaining the tightness and reliability of the entire system.

Characteristics of the used component

The presented vacuum reservoir comes from disassembly and is offered as a used part, which allows for reducing repair costs while maintaining the original design specifications. In the case of components from this group, the following are key:

• maintaining the tightness of the housing and ports,
• absence of mechanical damage affecting installation,
• proper cooperation with the existing vacuum pump. Choosing a used vacuum reservoir is particularly beneficial when servicing older Audi vehicles, where a reasonable balance between cost and functionality is essential.

Technical support and selection of TDI accessories

When replacing the vacuum reservoir in a diesel engine, it is worth analyzing the general condition of accessories, such as the vacuum pump, vacuum lines, or vacuum-controlled elements. Practical tips regarding the diagnosis and selection of used components in TDI units can be found in the article: Accessory failure in TSI and TDI engines – how to service your Volkswagen sensibly and avoid overpaying at the workshop.

Related Audi vacuum system components

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other elements from the same group, such as a vacuum pump, vacuum lines, or control valves, check the available parts in the Audi vacuum pumps category. Additionally, when preparing a diesel car for the autumn-winter season, it is worth verifying the condition of key components, including vacuum system elements, as described in the guide: winter essential for used parts before the frost.