BMW F87 M2 F80 M3 F82 M4 S55 N55 DSC Hydro Braking Unit Pump 7851298 8043645

BMW F87 M2 F80 M3 F82 M4 S55 N55 DSC Brake Booster 7851298 is an original component of the ABS and ESP System, designed for advanced sport versions of BMW with S55 and N55 engines. This is a factory BMW solution that ensures precise pressure control in the braking system and stable cooperation with the Dynamic Stability Control (DSC) system in M series cars.

Specifications and technical data

• SKU: 7851298-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7851298
• Substitutable numbers: 34517851298, 7851298, 34518043645, 8043645, 7852637
• Category: ABS & Stability Hydraulic Units

Purpose and Function in the Vehicle

The presented DSC brake booster is responsible for generating and modulating pressure in the braking system, cooperating with the control electronics of ABS and stability control systems. In BMW F87 M2, F80 M3, and F82 M4 models with S55 and N55 engines, it is responsible for:

• precise distribution of braking force to individual wheels,
• cooperation with the ABS system during emergency braking,
• stabilizing the vehicle's path within the DSC system during dynamic driving,
• maintaining appropriate braking characteristics in sport modes.

Thanks to its OEM design, the booster is fully integrated with the vehicle's electronic architecture, which translates into predictable vehicle behavior and consistent operation of all safety systems.

Advantages of Using an Original BMW DSC Booster

Choosing an original BMW DSC brake booster from the ABS and ESP System category is a solution that minimizes the risk of compatibility and calibration issues. Compared to unreliable aftermarket parts, an OEM part ensures:

• factory fit for the vehicle's hydraulic and electrical installation,
• correct cooperation with ABS/DSC controller software,
• stable operating parameters under high loads typical for M models,
• the possibility of correct system adaptation and bleeding using factory service procedures.

This is particularly important in high-performance and sporty cars where the braking system operates within a wider range of temperatures and pressures, and any error in the stability system's operation can affect driving safety.

Characteristics of a Used Part

The offered DSC brake booster is a used component, sourced from the disassembly of an original BMW vehicle. This type of OEM component retains the factory design and operating parameters intended by the manufacturer, while also being an economical alternative to a new part from an authorized dealer. In practice, this means:

• retention of original BMW build quality,
• absence of typical problems known from cheap aftermarket parts (leaks, communication errors, coding issues),
• possibility of direct installation in place of the damaged component, maintaining the factory geometry of lines and connectors.

Before installation, a standard service procedure is recommended: checking system tightness, bleeding, and performing DSC system adaptation/calibration using an appropriate diagnostic tester.

Integration with Other Braking System Components

The DSC booster in BMW M models works with multi-piston calipers, larger diameter discs, and advanced traction control algorithms. A correctly selected OEM component:

• maintains consistent operation of ABS, DSC, and potential MDM modes,
• ensures predictable vehicle behavior when braking on various surfaces,
• reduces the risk of controller errors resulting from mismatched booster parameters.

If you are simultaneously upgrading other drivetrain or suspension components, it is worth considering assembling a larger set of parts in one place – you can find more information on this approach in the article how to assemble original used car parts in one store.

Why Choose Original BMW Components

In high-performance cars like the BMW F87 M2, F80 M3, or F82 M4, the braking and stability control system is crucial for safety and consistent performance. Using an original DSC booster allows you to maintain the vehicle's factory operating characteristics while reducing repair costs by choosing a used part. If you are also diagnosing drivetrain components alongside the braking system, you will find useful information in the guide why a used OEM differential can be a better choice than a cheap aftermarket one.