Audi A8 D4 Brake Vacuum Pipe Pressure Sensor 3.0 TDI Diesel Engine 4H2611931H

Audi A8 D4 Brake Vacuum Pipe Pressure Sensor 3.0 TDI Diesel Engine is an original brake system component designed for diesel engines. Thanks to precise vacuum measurement in the brake circuit, it supports stable operation of the brake booster, which translates into repeatable braking performance and predictable vehicle behavior. This solution is particularly important in heavier, luxury limousines such as the Audi A8, where the braking system operates under significant load.

Specifications and technical data

• SKU: RHD-4H2611931H
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H2611931H
• Substitutable numbers: 4H2611931H, 4H2 611 931 H
• Fuel type: Diesel
• Category: Brake Hoses, Lines & Fittings

Purpose and function in the braking system

The offered element belongs to the Brake hoses, lines, and connectors group and is responsible for monitoring pressure in the vacuum circuit that works with the vacuum pump and brake booster. In a diesel engine, where high vacuum is generated, correct parameter reading is crucial for:

• stable brake booster operation under various engine loads,
• proper brake pedal response in emergency situations,
• maintaining the correct operating parameters of related safety systems.

In practice, a functional pressure sensor in the vacuum line helps to reduce issues such as a hard brake pedal, extended braking distance, or incorrect error messages in the controller.

Benefits of using an original Audi component

As an Audi brand part, the sensor has been designed for the specific architecture of the braking system in the A8 D4 model with the 3.0 TDI unit. This means:

• factory fitment to the existing electrical harness and vacuum lines,
• maintenance of operating parameters specified by the vehicle manufacturer,
• consistency with the diagnostic logic of the engine controller and safety systems.

As a result, installation is straightforward, without the need for system modifications, and the braking system retains the characteristics intended for a premium luxury limousine.

Operating characteristics in a diesel engine

In diesel units, vacuum is one of the fundamental parameters used to control many vehicle functions. The Audi A8 D4 Brake Vacuum Pipe Pressure Sensor 3.0 TDI works with the engine control system, enabling:

• monitoring of available vacuum for the brake booster,
• early detection of leaks in lines and connectors,
• precise response of safety systems to changing operating conditions.

Such a solution increases the predictability of brake operation across a wide range of speeds and loads, which is important for both city and highway driving.

Condition of the element and installation aspects

The offered sensor comes from a group of used parts, which allows for an economical repair of the braking system while maintaining the manufacturer's original specifications. Before installation, a standard workshop procedure is recommended, including checking the vacuum lines for leaks, verifying connectors, and performing computer diagnostics after installation to confirm the correct values read by the controller.

Brake system expansion and selection of other components

If you are planning a comprehensive repair or upgrade of the braking zone in your Audi and need other elements from the same group, such as flexible hoses, rigid pipe sections, or booster connectors, check the available parts in the Audi brake hoses, lines, and connectors category.

When selecting used brake system components – especially in premium vehicles – it is worth following proven inspection and verification procedures. Practical tips on how to assess the technical condition of components, what to look for during inspection, and how to interpret diagnostic data can be found in the article Second-hand braking system: how to safely choose discs, calipers, and ABS?.