Audi S4 B7 4.2 V8 Petrol Brake Servo Booster Master Cylinder 8E0612105Q

Brake Booster for Audi S4 B7 4.2 V8 Gasoline integrated with the brake master cylinder is a key component of the braking system, responsible for stable, predictable, and comfortable modulation of braking force. This kit from the Brake Boosters and Proportioning Valves category is designed specifically for the sporty Audi version with a V8 gasoline engine, ensuring adequate pressure reserve and reliable brake pedal operation. As an original Audi component, it guarantees a proper fit with the factory brake system architecture.

Specifications and technical data

• SKU: RHD-8E0612107L
• Mark: Audi
• Condition: Used
• OEM Part Number: 8E0612107L
• Substitutable numbers: 8E0612107L, 8E0 612 107 L, 8E0612105Q, 8E0 612 105 Q
• Fuel type: Petrol
• Category: Brake Servos

Purpose and Role in the Braking System

The presented brake booster integrated with the brake master cylinder is dedicated to a gasoline engine vehicle, meaning its operating characteristics have been matched to the parameters of the 4.2 V8 unit and the weight and performance of the Audi S4 B7. This component is responsible for:

• assisting the force applied to the brake pedal,
• stable pressure build-up in the brake circuits,
• repeatable system response during intense braking,
• maintaining appropriate braking force modulation throughout the pedal's operating range.

This ensures the driver receives predictable, consistent vehicle behavior during daily driving and dynamic use, which is particularly important in powerful gasoline versions.

Benefits of Using an Original Brake Booster with Proportioning Valve

Choosing an original Audi brake booster and proportioning valve allows you to maintain the factory characteristics of the braking system's operation, without the risk of undesirable changes in pedal travel or delayed braking response. Compared to aftermarket alternatives, the original component ensures:

• precise fit to the engine bay geometry and mounting points,
• proper cooperation with the ABS/ESP system,
• preservation of the manufacturer's designed braking force progression,
• compatibility with other system components, such as lines, calipers, and discs.

This solution is particularly recommended for repairs of higher-powered vehicles, where braking stability and repeatability directly impact safety and driving comfort.

Characteristics of a Used Component

The offered set is from a disassembly, meaning it is a used OEM component. This type of part offers a reasonable compromise between repair cost and maintaining original quality of workmanship and fit. In practice, this means:

• factory design consistent with manufacturer documentation,
• preservation of the original operating parameters of the brake booster and master cylinder,
• possibility of installation in place of the worn component without system modifications.

To maximize the potential of a used sub-assembly, it is advisable to ensure proper bleeding of the braking system and check the brake fluid condition after installation.

Professional Installation and Selection by Part Numbers

Due to the importance of the braking system for safety, installation by an experienced service center is recommended. They will verify the tightness of connections, correct pedal adjustment, and cooperation with the vehicle's electronics. When selecting this type of component, matching by catalog numbers and interchangeable part numbers is crucial, minimizing the risk of incompatibility with a specific equipment version.

If you want to better understand how to care for disassembled components and how to extend their reliable operation, check out practical tips in the article How to Extend the Lifespan of Used Car Parts?.

Audi Braking System Expansion

If you are planning a comprehensive repair or modernization of the braking area in your Audi and need other parts from the same group, such as brake master cylinders, brake boosters, or pressure regulators, check the available parts in the Audi Brake Boosters and Proportioning Valves category.