Audi A4 B8 Brake Servo Vacuum Pipe Hose Line Return Valve Petrol 8K0611931BQ

Audi A4 B8 Brake Servo Vacuum Pipe Hose Line Return Valve Petrol is an original brake assistance system component designed for petrol engine vehicles. It ensures a stable vacuum supply to the brake servo, which translates into predictable brake pedal operation and safe deceleration. This is a practical solution for users looking to restore the correct braking characteristics in their Audi.

Specifications and technical data

• SKU: 8K0611931BQ
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0611931BQ
• Substitutable numbers: 8K0611931BQ, 8K0 611 931 BQ
• Fuel type: Petrol
• Category: Vacuum Pumps

Function and role of the vacuum pipe

The brake servo vacuum pipe in the Audi A4 B8 is responsible for transporting vacuum from the vacuum generation system (e.g., vacuum pump or intake manifold) to the brake servo. A properly functioning pipe:

• ensures adequate assistance force with every press of the brake pedal,
• stabilizes the brake system response under various engine load conditions,
• reduces the risk of increased braking distance resulting from vacuum loss.

For petrol units, the pipe's tightness and resistance to temperature changes and vibrations are particularly important, as they ensure consistent servo operation.

Designed for petrol engines

The presented pipe has been designed for vehicles powered by petrol fuel. This means it is matched to the vacuum characteristics generated by these types of power units, as well as having an appropriate design in terms of:

• operating conditions in the petrol engine bay (temperature, vibrations, fuel vapors),
• pipe routing geometry relative to the intake manifold and brake servo,
• vacuum flow stability at varying engine speeds.

As a result, the pipe works with the brake system in a predictable manner, without the need for additional modifications.

Integration with the Vacuum pumps system

The product belongs to the Vacuum pumps category, which highlights its close connection to the vehicle's vacuum generation system. In practice, this means the pipe is the component connecting the vacuum source to the brake servo, and its condition has a direct impact on:

• the efficiency of the entire vacuum system,
• brake assistance performance during emergency braking,
• the overall refinement of the brake system in daily operation.

Selecting a pipe from the same functional group as the vacuum pump makes it easier to maintain technical consistency of the system and reduces the risk of compatibility issues.

Characteristics of the used component

The offered pipe is a used component, which allows for an economical restoration of the brake system's efficiency while maintaining the manufacturer's original specifications. In practice, this means:

• preservation of factory geometry and mounting points,
• easier installation in place of the old component,
• no need for adaptation or modifications to the installation.

For many Audi users, this is a reasonable compromise between repair costs and maintaining the original design of the brake system.

Support in selection and further system expansion

If you are planning a comprehensive repair or upgrade of the braking area in your Audi and need other elements from the same group, such as vacuum lines, connection elements, or components working with the servo, check the available parts in the Audi Vacuum pumps category.

To better understand the relationships between the engine fuel system and vacuum operation, a guide on diagnostics and selection of fuel components may be helpful – you can find a detailed discussion in the article "Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration".

If you are planning a wider vehicle repair and want to collect various original used parts in one place, practical tips on organizing purchases and avoiding random replacements can be found in the material on comprehensive sourcing of used car parts.