Audi A4 B8 Brake Servo Vacuum Pipe Hose Line 8K0611931BS

Audi A4 B8 Vacuum Hose Brake Booster is a component of the vacuum system responsible for stable brake assist in your Audi. A properly selected hose ensures correct brake booster operation, which translates to predictable braking force and pedal comfort. A used OEM part is a sensible choice for a technical brake system repair when fitment and functionality are key.

Specifications and technical data

• SKU: 8K0611931BS
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0611931BS
• Substitutable numbers: 8K0611931BS, 8K0 611 931 BS
• Category: Vacuum Pumps

Function and Role in the Braking System

The brake booster vacuum hose in the Audi A4 B8 is responsible for transporting vacuum from the vacuum-generating system to the booster, which amplifies the force applied to the brake pedal. A properly functioning hose:

• ensures stable brake assist across the full range of engine loads,
• reduces the risk of extended braking distances due to vacuum loss,
• minimizes braking efficiency drops during hard braking,
• maintains system seal, which is crucial for booster operation.

By maintaining the correct hose geometry and diameter, the vacuum system operates predictably, and the response to brake pedal application remains repeatable.

Compatibility and Fitment for Audi

The offered hose is designed for use in the Audi A4 B8 model, as indicated by the manufacturer. Using a part from the Vacuum Pumps group, originating from the same design family, allows for maintaining the factory hose routing, mounting points, and connection method to the booster and vacuum source.

Selecting a part according to manufacturer designations enables:

• avoiding issues with hose length or diameter,
• retaining original mounting brackets and clips,
• correct routing in the engine bay without stress or kinks.

Characteristics of a Used Vacuum Hose

A used brake booster vacuum hose is an economical yet technically sound solution, provided the component remains sealed and shows no signs of mechanical damage. In practice, this means:

• the hose should not have cracks, abrasions, or signs of excessive wear,
• the connection ends must ensure a stable, sealed connection,
• the hose walls should retain adequate stiffness to prevent collapse under vacuum.

By choosing such a part, you are investing in a component with factory geometry and fitment, which facilitates installation and reduces the risk of leaks in the brake assist system.

Benefits of Using an Original Vacuum Hose

Using a vacuum hose dedicated to the Audi A4 B8 translates into specific operational benefits:

• Stable Brake Assist – correct vacuum in the booster ensures predictable braking force.
• Factory Fitment – the original hose geometry simplifies installation and eliminates the need for modifications.
• Consistency with the Vacuum Pumps System – the hose works with the factory vacuum source, maintaining the system's design parameters.

For users who prioritize technically correct repairs, such a component offers a sensible compromise between cost, quality, and fitment.

Expanding Vacuum and Braking System Service

If you are planning a comprehensive repair or upgrade of the braking area in your Audi and need other components from the same group, such as vacuum hoses, connectors, or parts that work with the booster, check the available parts in the Audi Vacuum Pumps category.

When working on the braking and vacuum system, it is also advisable to pay attention to the correct selection of components according to manufacturer designations and the vehicle's service history. In this context, a guide on diagnostics and component selection based on factory designations may be helpful – you can find it in the article Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair, which discusses practical principles for working with catalog numbers and service procedures.