Audi A4 B8 Brake Servo Booster Master Cylinder Braking Unit 1K2614105BN

Visual condition of the part

The product shows signs of use visible in the photos.

Audi A4 B8 Brake Servo Booster Master Cylinder Braking Unit integrated with the master brake cylinder is a key component of the braking system, responsible for the stable transfer of force from the pedal to the calipers. This brake servo and master cylinder assembly has been designed by the manufacturer for precise cooperation with the vehicle's hydraulic system and electronics, ensuring predictable brake response in daily operation.

Specifications and technical data

• SKU: RHD-1K2614105BN-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 1K2614105BN
• Substitutable numbers: 1K2614105BN, 1K2 614 105 BN, 252078499809
• Category: Master Cylinders

Purpose and function in the braking system

The described brake servo and master cylinder assembly is a component from the Brake master cylinders group, responsible for generating and stabilizing pressure in the hydraulic system. In practice, this means:

• effective assistance of the brake pedal pressure force,
• more linear and predictable braking characteristics,
• consistent operation with the vehicle's factory ABS/ESP system.

Thanks to the factory design intended for Audi, this assembly allows for maintaining the proper operating parameters of the braking system, which translates into driving comfort and safety.

Benefits of using an original Audi assembly

Choosing an original Audi brake servo and master cylinder assembly primarily ensures a secure fit for the specific vehicle platform. The component has been designed with the following in mind:

• compatibility with engine bay geometry and factory mounts,
• correct diameter and stroke of the master brake cylinder piston,
• appropriate force ratio in the servo relative to the vehicle's weight and character.

Such a solution reduces the risk of problems with bleeding, non-linear pedal operation, or incorrect interaction with the vehicle's electronics. This is particularly important for cars used dynamically or over longer distances.

Characteristics of the used component

The offered assembly belongs to the group of used OEM parts, which means it comes from vehicle dismantling and not from the aftermarket. These types of components are preferred by mechanics and informed users because they:

• retain the manufacturer's factory technical specifications,
• often feature better durability than cheaper replacements,
• allow for optimizing repair costs while maintaining high quality.

Before installation, a standard workshop procedure is recommended: checking for leaks, the condition of connectors and mounts, and properly bleeding the entire braking system in accordance with service documentation.

Selection and integration with the braking system

To correctly select the brake servo and master cylinder assembly for a specific Audi version, it is worth verifying compatibility with the vehicle configuration (body type, engine version, braking system used). It is helpful to compare:

• the shape and layout of brake line connectors,
• the type of mounting to the bulkhead and brake pedal,
• the geometry of the connection to the vacuum system.

This approach minimizes the risk of installation problems and ensures that the braking system will operate within the parameters specified by the manufacturer. This is particularly important in vehicles equipped with advanced electronic stability control systems.

Brake system service expansion and technical knowledge

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 additional pumps, reservoirs, or control elements, check the available parts in the Audi Brake master cylinders category.

When working on the braking system, it is also worth taking a conscious approach to selecting other components, such as calipers or lines. Practical tips on the safe use of dismantled parts and ways to reduce service costs can be found in the article Brake calipers under the microscope: how to reduce braking system repair costs by choosing proven recycled parts, which helps organize knowledge about the quality and selection of used braking components.