Audi A4 B7 Brake Servo Fluid Expansion Tank Reservoir Master Cylinder 8E0611301G

Audi A4 B7 Brake Servo Fluid Expansion Tank Reservoir Master Cylinder is an original brake system component designed for Audi models, ensuring a stable hydraulic supply to the brake master cylinder and servo. Thanks to its factory OEM design, the reservoir guarantees proper fluid delivery, which translates into consistent brake pedal performance and the safe operation of the entire system. It is a practical solution for users who want to maintain consistency of brake components with the vehicle's factory specifications.

Specifications and technical data

• SKU: 8E0611301G-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 8E0611301G
• Substitutable numbers: 8E0611301G, 8E0 611 301 G
• Part type: Brake Fluid Reservoir
• Category: Reservoirs & Caps

Purpose and function in the brake system

The presented reservoir is responsible for storing brake fluid and supplying it steadily to the brake master cylinder and servo. A properly selected component in this group is crucial for:

• maintaining the correct fluid level throughout the system,
• preventing air from entering the brake lines,
• maintaining proper operating pressure during braking,
• clear monitoring of fluid levels during vehicle operation. Thanks to a design consistent with Audi factory solutions, the reservoir works with the brake servo and master cylinder in a predictable manner, which facilitates diagnostics and subsequent system maintenance.

Original origin and fitment for Audi

The component comes from the line of original Audi parts, which means it maintains the geometry, mounting points, and connector diameters consistent with the factory design. Such fitment reduces the risk of leaks, stress on lines, and assembly problems that often occur with cheap replacements. The original brake fluid reservoir is a particularly advantageous choice for vehicle repairs where the consistency of brake system components is important – both in terms of safety and the future resale value of the car.

Characteristics of the used component

The product is offered as a used part, which allows for a significant reduction in repair costs while maintaining factory specifications. In practice, this means the possibility of replacing a damaged or worn reservoir with an original equivalent without the need to invest in a new component from an authorized service center. Choosing a used reservoir from the original parts group is a reasonable compromise between price and quality – especially for components that are not subject to typical wear and tear to the same extent as moving parts, yet must maintain proper tightness and resistance to brake fluid.

Technical support and part selection

When selecting a reservoir for a specific version of the Audi A4 B7, it is worth paying attention to compatibility with the installed brake servo and master cylinder, as well as the system configuration (e.g., the type of brake equipment used). Original manufacturer markings and reference numbers allow for precise identification and minimize the risk of errors during purchase. 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 lines, caps, or additional fluid reservoirs, check the available parts in the Audi brake fluid reservoirs and caps category. To better plan your brake system repair budget and consciously use original recycled parts, it is worth reading the guide: Brake calipers under the microscope: How to effectively reduce brake system repair costs by choosing proven recycled parts.