Audi Q7 4M Brake Servo Master Fluid Reservoir Expansion Tank Bottle 8W0611301

The Audi Q7 4M Brake Fluid Reservoir is an original component of the braking system, designed to work with the brake servo and master cylinder in this model. Thanks to its factory design, it ensures stable fluid supply to the braking system and proper cooperation with other components. A used OEM part is a sensible choice for vehicle servicing when you want to maintain compliance with the factory Audi specification.

Specifications and technical data

• SKU: 8W0611301
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0611301
• Substitutable numbers: 8W0611301, 8W0 611 301
• Category: Reservoirs & Caps

Purpose and Function in the Braking System

The Audi Q7 4M Brake Servo Master Fluid Reservoir Expansion Tank Bottle plays a crucial role in the hydraulic brake supply system. It is responsible for storing brake fluid, compensating for its volume changes due to temperature fluctuations, and ensuring a stable supply of the medium to the master cylinder and brake servo.

The factory design of the reservoir ensures:

• a properly shaped working chamber that limits fluid aeration,
• manufacturer-specified connection points to the braking system,
• compatibility with the original mounting in the engine bay of the Audi Q7 4M generation.

Benefits of Using an Original Audi Reservoir

Using an original reservoir from the Brake Fluid Reservoirs and Caps group for an Audi allows you to maintain the system's operating parameters as intended by the vehicle manufacturer. In practice, this means:

• correct brake fluid level and circulation across the entire operating temperature range,
• material compatibility with other system components (hoses, seals, pump),
• reduced risk of leaks due to mismatched shapes or spigots.

A used OEM part is particularly attractive for repairs where technical compliance with the factory design and predictable long-term performance are important.

Selection and Technical Compatibility

When selecting a brake fluid reservoir for the Audi Q7 4M, matching it to the specific version of the braking system and servo is crucial. This reservoir model is designed to work with the factory master cylinder and brake assist system used in the Q7 4M generation, which simplifies installation and reduces the need for modifications.

It is worth paying attention to:

• spigot design compatibility with existing hoses,
• proper positioning of the reservoir relative to the brake servo,
• suitability for use with brake fluids specified by Audi for this model.

This ensures a streamlined installation process and that the braking system retains its original performance characteristics.

Component Condition and Service Application

The offered reservoir is in used condition, making it a practical solution for service repairs when a damaged or leaking component needs replacement. This type of part is suitable for both standard brake system maintenance and more extensive work, such as replacing the master cylinder or servo.

Before installation, standard service procedures are recommended, including checking the system for leaks, bleeding the brakes, and verifying the fluid level according to the vehicle manufacturer's recommendations.

Expanding Brake System Service and Technical Knowledge

If you are planning a comprehensive repair or upgrade of the braking area in your Audi and need other parts from the same group, such as additional reservoirs, caps, or mounting elements, check the available parts in the Audi Brake Fluid Reservoirs and Caps category.

When working with used brake system components, it is advisable to rely on proven inspection and installation procedures. Detailed guidance on safely selecting used components such as discs, calipers, or ABS modules can be found in the article: Second-hand braking system: how to safely choose discs, calipers, and ABS?