Audi A8 D4 Vacuum Pipe Hose Line Tube Brake Servo 3.0 TDI Diesel 4H0611931AG

Audi A8 D4 Vacuum Pipe Hose Line Tube Brake Servo 3.0 TDI Diesel is a specialized brake system component designed for diesel engines, ensuring stable vacuum pressure for the brake servo. Thanks to its precise geometry and fitment for the A8 D4 platform, the pipe guarantees consistent brake booster performance and predictable pedal response. This is a solution for users who expect technically correct brake system operation in diesel-powered vehicles.

Specifications and technical data

• SKU: 4H0611931AG
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0611931AG
• Substitutable numbers: 4H0611931AG, 4H0 611 931 AG
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the brake system

The brake servo vacuum pipe in the Audi A8 D4 is responsible for transporting vacuum from the diesel engine's supply system to the brake servo. A properly functioning pipe:

• ensures stable brake assistance across the full range of engine loads,
• reduces the risk of decreased braking efficiency during sudden braking,
• maintains the tightness of the vacuum system, which translates into repeatable brake pedal force.

In diesel units, where vacuum generation occurs differently than in gasoline engines, a properly selected pipe is crucial for the safe and predictable operation of the brake system.

Construction and fitment for Audi A8 D4 3.0 TDI

The component belongs to the Pipes, hoses, and tubes group, meaning it has been designed to work in an environment of variable pressures and temperatures typical of the engine bay. The pipe's construction is optimized for:

• wall rigidity to limit deflection during vacuum changes,
• resistance to vibrations transmitted from the diesel power unit,
• routing in the engine bay so as not to interfere with other components.

Thanks to its factory fitment for the A8 D4 platform, the pipe maintains the correct installation geometry, which facilitates service and minimizes the risk of leaks resulting from installation stress.

Performance characteristics and advantages of use

Choosing an original brake servo vacuum pipe for an Audi with a diesel engine allows you to maintain braking parameters consistent with the manufacturer's specifications. The use of this component promotes:

• maintaining uniform assistance force on the brake pedal,
• reducing the risk of air ingress or loss of vacuum in the system,
• stable operation of the brake servo in both city and highway conditions.

For users who prioritize consistent brake system operation and want to avoid problems with a hard brake pedal, a correctly selected vacuum pipe is an essential element of preventive maintenance.

Component condition and service application

The product is offered in a used condition, which allows for an economical repair of the brake system while maintaining the original installation specification. This type of solution is particularly beneficial in the case of:

• accident repairs where pipes in the engine bay have been damaged,
• servicing high-mileage vehicles where vacuum system leaks have occurred,
• the need for a quick replacement of the component while maintaining compliance with the factory pipe routing system.

Selecting a pipe dedicated to the diesel unit reduces the risk of compatibility issues and ensures predictable vehicle behavior during braking.

Expanding the brake system in Audi

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 brake hoses, rigid pipes, or vacuum hoses, check out the available parts in the Audi pipes, hoses, and tubes category.

When planning broader modifications or repairs, especially in vehicles with a diesel engine, it is also worth paying attention to the selection of used components. Additional tips on the safe selection of such elements and avoiding common mistakes in tuning projects can be found in the article Buying used car parts – the most common mistakes when choosing parts for tuning.