Audi A4 B8 A5 8T Brake Servo Booster Vacuum Pipe Hose Line 8K0611931CP

Audi A4 B8 A5 8T Brake Servo Vacuum Hose is an original part from the Hoses, Tubes, and Pipes group, designed for the brake assist system in Audi A4 B8 and Audi A5 8T models. It ensures a sealed vacuum connection between the pump and the servo, which translates to stable, predictable brake pedal feel and safe deceleration.

Specifications and technical data

• SKU: 8K0611931CP
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0611931CP
• Substitutable numbers: 8K0611931CP, 8K0 611 931 CP
• Category: Hoses, Lines & Pipes

Purpose and Function in the Braking System

The brake servo vacuum hose is responsible for transporting vacuum from the engine unit or vacuum pump to the servo, which amplifies the braking force applied to the pedal. A correctly selected and sealed component:

• stabilizes brake assist operation under typical road conditions,
• reduces the risk of braking effectiveness loss during sudden braking,
• ensures repeatable brake pedal characteristics, important for daily driving.

Thanks to its construction conforming to factory Audi standards, the hose maintains the correct routing geometry, minimizing stress, twisting, and potential leaks in the system.

Construction and Fitment for Audi A4 B8 / A5 8T

This part has been designed as a system component for the Audi A4 B8 and Audi A5 8T platforms, maintaining original mounting points and routing within the engine bay. This means:

• precise fitment to the stock brake servo and vacuum source,
• preservation of the factory hose routing path,
• compatibility with adjacent accessories and covers.

This solution facilitates installation and avoids interference with other braking system components or engine bay parts.

Performance Characteristics and Benefits of Use

A properly selected vacuum hose in the brake servo system directly impacts driving comfort and safety. Using an original Audi part allows for:

• consistent brake assist operation across the entire load range,
• reduction of vacuum loss risk due to leaks or improper hose placement,
• maintenance of braking system performance parameters as intended by the vehicle manufacturer.

The product belongs to the Hoses, Tubes, and Pipes group, meaning it is structurally adapted for operation in environments with elevated temperatures and variable pressure conditions typical of the engine bay.

Condition, Verification, and Service Application

The offered hose is a used part, making it an attractive cost-effective alternative while maintaining original assembly specifications. This type of part is particularly suitable for situations where:

• the existing hose shows signs of wear, cracking, or leaks,
• a repair restoring the functionality of the brake assist system is necessary,
• preserving the original technical configuration of the vehicle is a priority.

Before installation, a standard check for leaks and correct hose routing in the vehicle is recommended, following Audi service procedures.

Braking System Expansion and Auxiliary Materials

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 hoses, flexible pipes, or rigid tubes for working fluid, check the available parts in the Audi Hoses, Tubes, and Pipes category.

When selecting used braking system components – including hoses, calipers, or control components – it is advisable to consult practical tips and checklists. The article Used Braking System: How to Safely Choose Discs, Calipers, and ABS?, which discusses key aspects of safely choosing parts from the aftermarket, may be helpful.