Audi A5 8T Brake Servo Master Cylinder 2.0 TDI CSUB Diesel Engine 8K0612103N

Audi A5 8T Brake Servo Master Cylinder 2.0 TDI CSUB Diesel Engine for diesel engines is a factory-original brake system component, designed specifically for the 2.0 TDI unit. The original Audi design ensures proper brake pedal force transmission, stable booster operation, and predictable vehicle behavior during daily use.

Specifications and technical data

• SKU: 8K0612103N-2
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0612103N
• Substitutable numbers: 8K0612103N, 8K0 612 103 N
• Fuel type: Diesel
• Part type: Brake Servo
• Category: Brake Servos

Purpose and compatibility

The offered brake servo and master cylinder set is designed for the brake system of the Audi A5 8T generation with a diesel engine. Using a component from the same model platform allows for maintaining factory operating parameters, including booster characteristics, pedal travel, and response to emergency braking.

Selecting parts for a diesel unit is crucial for proper cooperation with the vacuum-assisted braking system, which is why using the original brake servo and master cylinder is a technically safe and predictable solution for long-term operation.

Construction and function in the brake system

The brake servo is responsible for increasing the force exerted by the driver on the brake pedal, utilizing the vacuum generated by the diesel engine. The integrated master cylinder distributes hydraulic pressure to the brake circuits, ensuring uniform caliper operation and stable vehicle tracking during braking.

In practice, this means:

• more precise braking force modulation at various speeds,
• maintaining proper brake pedal stiffness,
• correct cooperation with other brake system components, such as lines, calipers, and brake force regulators.

Thanks to the use of an original Audi solution, the system retains its factory operating characteristics, which is essential for both driving comfort and safety.

Category: Audi Brake Servos and Regulators

This component belongs to the Brake Servos and Regulators group, which includes sub-assemblies responsible for proper distribution of braking force between axles and for assisting pedal pressure. If you are planning a comprehensive repair or upgrade of the braking zone in your Audi and need other items from the same group, such as additional servos, brake force regulators, or related control elements, check the available parts in the Audi Brake Servos and Regulators category.

Used condition and technical aspects of installation

The offered sub-assembly is in used condition, which, in the case of original Audi parts, allows for combining a favorable purchase cost with the preservation of factory build quality. Before installation, a standard inspection of the brake system is recommended, including checking the tightness of lines and the condition of the brake fluid, to fully utilize the potential of the installed servo and master cylinder.

The replacement of the brake servo and master cylinder should be carried out by a workshop experienced in working with brake systems, following bleeding and leak-check procedures. A correctly installed component restores predictable brake pedal response and vehicle stability during intense braking.

Why choose an original Audi servo

For key brake system components, using original Audi solutions limits the risk of improper booster operation, uneven braking force distribution, or compatibility issues with other sub-assemblies. This is particularly important in cars with diesel engines, where the vacuum system is an integral part of the design.

If you want to better understand how to safely select used OEM components and how to plan their service in the context of the entire vehicle, our blog article will be helpful: Air conditioning and heating – part selection and maintenance for year-round comfort, which discusses practical principles of working with original components in a car.

In case of doubts regarding used brake system elements and other vehicle sub-assemblies, it is also worth reading the educational material Used car parts: Myths and facts you need to know, which clarifies common concerns related to the use of second-hand parts.