Audi A4 B8 A5 8T Brake Servo Vacuum Hose Pipe 8K0611931AL

Audi A4 B8 A5 8T Brake Servo Vacuum Hose Pipe is a braking system component from the Lines, hoses and pipes group, designed specifically for use with the brake servo in Audi A4 B8 and Audi A5 8T models. It is responsible for the stable supply of vacuum to the brake booster, which translates into predictable pedal response and safe deceleration.

Specifications and technical data

• SKU: 8K0611931AL
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0611931AL
• Substitutable numbers: 8K0611931AL, 8K0 611 931 AL, 8K0611931BT, 8K0 611 931 BT
• Part type: Hose
• Category: Hoses, Lines & Pipes

Function and role in the braking system

The brake servo vacuum hose plays a key role in generating the appropriate braking force assistance. It maintains a tight connection between the vacuum source and the servo, ensuring that:

• the brake pedal operates with predictable resistance,
• braking force is stable and repeatable,
• the braking system reacts quickly to driver input.

For Audi A4 B8 and A5 8T class vehicles, a properly functioning vacuum hose is essential for safety and daily driving comfort.

Construction and fitment for Audi

The offered hose has been designed for specific Audi design solutions, ensuring proper routing in the engine bay and a perfect fit to the servo ports and vacuum source. The appropriately selected inner diameter and shape of the hose limit vacuum drops, while the correct wall stiffness minimizes the risk of kinking during engine operation.

Such design compatibility allows for installation without the need for modifications, and the braking system retains parameters close to factory specifications. This is particularly important when servicing vehicles where compliance with manufacturer solutions is a priority.

Benefits of using an original vacuum hose

Using a vacuum hose dedicated to the Audi A4 B8 and A5 8T provides a number of practical benefits:

• Stable brake assistance – proper vacuum flow ensures repeatable system response.
• Reduced risk of leaks – matched ends and hose geometry reduce the possibility of connection failure.
• Easier diagnostics – using a component consistent with Audi solutions facilitates work for service centers and mechanics.
• Consistency with other braking system components – the hose works in harmony with the factory servo and accessories.

This makes the hose a good choice when replacing a worn or damaged part, especially when maintaining braking characteristics close to factory standards is desired.

Product characteristics and condition

The hose comes from the Audi range and is a secondary market component, which allows for economical repair while maintaining compliance with the vehicle's original design. A used component of this type is a popular choice in professional workshops where the cost-to-functionality ratio and fitment for a specific model are important.

Before installation, it is recommended to perform a standard check of the seal and the condition of the connection surfaces so that the braking system can operate under stable conditions.

Application in service and braking system upgrades

The brake servo vacuum hose is suitable for both typical replacement of a worn part and broader service work within the braking system. It can be used in vehicles driven daily, where predictable brake operation and maintaining parameters close to factory Audi settings are important.

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

If you want to better understand the specifics of the secondary market and make informed choices when selecting pre-owned components, it is worth reading our educational material Used car parts: Myths and facts you need to know, which helps separate reliable information from common misconceptions.