Audi A4 B8 A5 8T Brake Servo Vacuum Pipe Hose Line 3.2 FSI 8K0611931BF

Audi A4 B8 A5 8T Brake Servo Vacuum Pipe Hose Line 3.2 FSI is an original part from the Lines, hoses and pipes group, designed for the brake booster system in Audi models with a 3.2 FSI engine. It ensures stable vacuum routing between the intake manifold and the brake servo, which translates into predictable brake pedal operation and safe deceleration.

Specifications and technical data

• SKU: 8K0611931BF
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0611931BF
• Substitutable numbers: 8K0611931BF, 8K0 611 931 BF
• Category: Hoses, Lines & Pipes

Purpose and function in the brake system

The presented vacuum hose is a component of the brake booster system in the Audi A4 B8 and Audi A5 8T with a 3.2 FSI unit. It is responsible for the airtight and stable delivery of vacuum to the brake servo, which enables the correct level of assistance when the brake pedal is pressed.

A properly selected hose in this section of the brake system reduces the risk of vacuum drops, uneven booster operation, and increased braking distance. Replacing a worn or leaking component with an original part from the same design group allows for the restoration of factory operating parameters.

Construction and fitment for Audi A4 B8 / A5 8T

The hose has been designed specifically for the engine bay geometry of the Audi A4 B8 and Audi A5 8T with a 3.2 FSI engine, ensuring proper routing relative to the intake manifold, servo, and adjacent components. The appropriately selected length, diameter, and shape of the hose sections facilitate installation and minimize stress during engine operation.

Original mounts and hose ends allow for secure seating in factory sockets without the need for modifications or the use of additional adapters. This solution helps maintain system integrity and reduces the risk of accidental disconnection during operation.

Benefits of using an original vacuum hose

• Stable brake servo operation – proper vacuum translates into a predictable brake pedal response.
• Better consistency of braking force under various engine load conditions.
• Reduced risk of leaks in a critical section of the vacuum system.
• Perfect fit for factory brackets and routings in the Audi A4 B8 / A5 8T engine bay.
• Ability to restore the original performance parameters of the brake system after the failure of an old hose.

Condition, service application and installation

The item comes from disassembly and is offered as a used part, which allows for an economical repair of the brake booster system while maintaining the original design specifications. This type of hose is particularly useful when troubleshooting issues related to a hard brake pedal, uneven booster operation, or diagnostic errors concerning the vacuum circuit.

During installation, it is recommended to check the condition of the connectors, clamps, and adjacent vacuum lines to ensure the full integrity of the entire system. Replacing the hose with an original component from the same design group simplifies service work and reduces the time required to fit the part.

System expansion – other lines and hoses for Audi

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 flexible lines, rigid pipes, or additional vacuum hoses, check the available parts in the Audi lines, hoses and pipes category.

For users interested in a broader perspective on car upgrades and the selection of used parts, an article describing the evolution of VW sports models may be helpful – you can find it here: Hot-hatch legend: the evolution of the VW Golf GTI from Mk1 to Mk8 – design changes and VW car parts.