Audi A6 C6 Brake Servo Vacuum Pipe Hose Tube Line Non-Return Valve 4F0611931CN

Audi A6 C6 Brake Servo Vacuum Pipe Hose Tube Line Non-Return Valve is an original brake system component responsible for the stable supply of vacuum to the brake servo and the proper operation of the brake booster. Thanks to its factory design, the pipe ensures a secure seal of the system and the correct flow direction due to the integrated non-return valve, which translates into consistent braking performance in daily use.

Specifications and technical data

• SKU: 4F0611931CN
• Mark: Audi
• Condition: Used
• OEM Part Number: 4F0611931CN
• Substitutable numbers: 4F0 611 931 CN, 4F0611931CN, 4F0 611 931 ED, 4F0611931ED, 8K0 611 743 C, 8K0611743C
• Part type: Pipe
• Category: Hoses, Lines & Pipes

Function and role in the brake system

The vacuum pipe with a non-return valve plays a crucial role in the operation of the brake servo, maintaining the appropriate vacuum level between the manifold and the booster. The integrated non-return valve protects the system against pressure backflow, which is particularly important during sudden braking and changes in engine load. As a result, the brake pedal maintains a predictable feel, and the system's response is stable and consistent.

Construction and fitment for Audi A6 C6

The component has been designed specifically for the engine bay geometry of the Audi A6 C6, which ensures proper routing of the pipe, no tension, and a reduced risk of abrasion. Properly selected connector diameters and the shape of the pipe facilitate installation at factory mounting points, without the need for modifications or the use of additional adapters. This type of solution allows for maintaining the original installation path and proper cooperation with the brake servo.

Benefits of using an original pipe

Using an original vacuum pipe with a non-return valve in the Audi A6 C6 helps to reduce typical problems associated with leaks, a decrease in booster efficiency, and an unstable brake pedal feel. The main advantages include:

• factory fitment to the brake system and engine accessories,
• maintenance of the correct flow direction thanks to the built-in non-return valve,
• reduced risk of vacuum loss during dynamic driving,
• easier brake system diagnostics due to maintaining the original configuration. For the user, this means more predictable vehicle behavior during braking and a lower risk of improper booster operation in critical road situations.

Condition, verification, and preparation for installation

The offered pipe belongs to the Pipes, hoses, and tubes group, which means it is a wear-and-tear component exposed to thermal and mechanical conditions in the engine bay. As a used part, it has been verified for the integrity of the body, connectors, and the correct operation of the non-return valve. Before installation, it is recommended to perform a standard check of the vacuum system for leaks and to assess the condition of cooperating components, such as the brake servo or supply lines.

Part selection and technical support

To select the correct brake servo vacuum pipe with a non-return valve for a specific Audi configuration, it is worth using the VIN number and the manufacturer's documentation. In the case of expanding or repairing the entire vacuum line, it may be helpful to browse other items in the Pipes, hoses, and tubes category, which will make it easier to complete the entire mounting kit in one place. If you want to verify the compatibility of the part with your car step by step, check the practical tips in the article 5 steps to safely selecting car parts, where, among other things, the use of the VIN number, manufacturer catalogs, and comparing offers before installation are described.