Audi A5 8T Brake Servo Master Fluid Reservoir Expansion Tank Bottle 4G2611021

Audi A5 8T Brake Servo Master Fluid Reservoir Expansion Tank Bottle is an original brake system component designed for installation in Audi A5 8T generation models. This factory expansion tank ensures stable storage of brake fluid, supporting the proper operation of the brake servo and master cylinder, as well as maintaining the correct pressure in the system.

Specifications and technical data

• SKU: 4G2611021
• Mark: Audi
• Condition: Used
• OEM Part Number: 4G2611021
• Substitutable numbers: 4G2611021, 4G2 611 021
• Category: Reservoirs & Caps

Purpose and function in the brake system

The offered tank is a component from the Brake fluid reservoirs and caps group, responsible for the safe storage of fluid and its delivery to the brake master cylinder and servo. A correctly selected and leak-free tank minimizes the risk of air entering the system, facilitates system bleeding, and allows for clear fluid level monitoring during service.

Its original Audi origin ensures the correct geometry of the ports, proper fitment to the brake master cylinder, and compatibility with factory mounts in the engine bay of the A5 8T model.

Construction and fitment for Audi A5 8T

This brake fluid reservoir has been designed specifically for the brake system architecture of the Audi A5 8T. It includes:

• a tank body adapted for use with the brake servo and master cylinder,
• connection ports matched to factory hoses,
• a cap location allowing for easy service access.

Thanks to the adherence to original specifications, installation is predictable, without the need for modifying brackets or hoses, which is particularly important when working with the brake system where high repeatability and connection tightness are required.

Used condition and benefits of choosing OE parts

The item is offered in used condition, which allows for a significant reduction in repair costs compared to new OE components, while maintaining the original design and fitment. In the case of brake fluid reservoirs, it is particularly important that the body is not mechanically damaged and that the connections retain their proper shape – a used original part usually meets these requirements better than cheap replacements with simplified geometry.

For users planning a broader brake system service, choosing original, used components is often a reasonable compromise between costs, durability, and installation predictability.

Safety, service, and part selection

A functional brake fluid reservoir has a direct impact on braking comfort and safety – it enables the maintenance of the correct fluid level, limits the risk of contaminants entering the pump, and facilitates system condition monitoring during inspections. When selecting the component, it is worth paying attention to compatibility with the specific version of the Audi A5 8T and ensuring it comes from the same design family as the originally installed unit.

If you are planning a comprehensive repair or upgrade of the braking zone in your Audi and need other elements from the same group, such as additional reservoirs, caps, or pump supply components, check the available parts in the Audi brake fluid reservoirs and caps category.

Expert support and cost optimization

When working with the brake system, it is worth using proven sources of knowledge regarding the selection and operation of used components. To better plan your service and understand how to safely use reclaimed parts within the brake system, read the article Brake calipers under the microscope: How to effectively reduce brake system repair costs by choosing proven reclaimed parts.

If you are considering whether new or used components are a better choice in your case, the guide Car parts – new or used? We compare costs, quality, and durability, which discusses the differences in cost-effectiveness and durability of both solutions, may be helpful.