Brake Servo Unit BMW F30 LCI F87 M2 F80 M3 Brake Master Cylinder 7849876 2284896

The Brake Servo Unit BMW F30 LCI F87 M2 F80 M3 Brake Master Cylinder is an original BMW brake system component designed for F-series models, including sport M versions. Thanks to its factory BMW construction and precise fit for the specific vehicle platform, this part ensures stable brake assistance and predictable pedal characteristics, resulting in safe and repeatable brake system operation.

Specifications and technical data

• SKU: 7849876
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7849876
• Substitutable numbers: 34337849876, 7849876, 34337849879, 7849879, 34337851569, 7851569, 34336796531, 6796531, 34337852160, 7852160, BG
• Category: Brake Servos

Technical Characteristics and Purpose

The presented brake servo and master cylinder assembly was designed by BMW as a brake system component for the F platform, including the F30 LCI and sport models F87 M2 and F80 M3, among others. The servo's design ensures appropriate transmission of pedal force to hydraulic circuit pressure, which is crucial for dynamic driving and intensive brake usage.

Combining the servo and master cylinder into a single unit reduces the number of connections, simplifies installation, and facilitates diagnosis of potential leaks. Using an original BMW solution allows for the preservation of the system's factory operating parameters, including pedal linearity and predictable vehicle response to braking.

Benefits of Using an Original BMW Servo

Replacing a worn component with an original BMW brake servo and master cylinder assembly restores the factory braking characteristics, which is important for both daily driving and conditions involving increased thermal load on the brake system. Compared to aftermarket alternatives, an OEM part is designed for a specific platform, taking into account vehicle weight, load distribution, and ABS/ESP system configuration.

Key advantages of using this component include:

• maintaining the factory brake force balance between axles,
• consistent operation with stability control and ABS systems,
• appropriately selected assistance characteristics for high-performance models like the M2 and M3,
• easier integration with the existing hydraulic and vacuum systems.

Condition, Origin, and Installation Aspects

The offered component comes from the BMW product line and is classified as a used part, allowing for economical brake system repair while retaining an OEM component. This type of solution is particularly attractive for users who want to maintain the original vehicle specification without resorting to cheaper aftermarket parts with uncertain parameters.

Before installation, standard workshop procedures are recommended, including checking system tightness, proper bleeding of brake circuits, and verifying compatibility with vehicle electronics. A correctly selected and installed brake servo and master cylinder assembly can reduce braking distance and improve brake repeatability, which is important in both city traffic and highway driving.

Practical Application and Part Selection

Due to the specific requirements of the F30 LCI, F87 M2, and F80 M3 models, selecting the correct brake servo with master cylinder should be based on BMW's catalog data and the reference numbers specified by the manufacturer. An original assembly from this range ensures compatibility with factory calipers, discs, and brake system control unit software.

When planning a replacement, it is also worth considering the condition of other system components, such as flexible hoses, brake fluid, or wheel hardware. A comprehensive approach to brake servicing allows for full utilization of the potential of the installed servo and master cylinder and reduces the risk of subsequent service interventions.

How to Care for Used Brake System Components?

For used parts, proper usage and regular technical condition checks are crucial. It is worth familiarizing yourself with practical tips for operating disassembled components – you can find them in the article How to Extend the Lifespan of Used Car Parts?, which describes proven methods for maintaining and diagnosing mechanical and electronic components.

Additionally, we encourage you to explore the full range of components in the BMW Brake Servos and Force Regulators – Selection and Operation Guide, which will help you make an informed choice of parts tailored to your specific vehicle configuration and driving style.