BMW 1 3 Series E81 E87 E90 ABS DSC Module Pump ECU Hydro unit 6784763 6784764

The BMW E81 E87 E90 Brake Master Cylinder ABS DSC is an original brake system component designed for BMW 1 and 3 Series models, working in conjunction with ABS and DSC systems. Thanks to its factory design, it ensures consistent operation of the brake hydraulics and driving stability electronics, which translates to safe and predictable vehicle behavior. A used OEM part is a sensible choice for professional repairs when you prioritize compatibility with the factory installation and maintaining the system's operating parameters.

Specifications and technical data

• SKU: 6784763
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6784763 6784764
• Substitutable numbers: 34506784809, 34516784763, 34526784764, 6784809, 6784763, 6784764, 34512460463, 2460463
• Category: Other Brake Parts

Purpose and Function in the Braking System

The described brake master cylinder works in conjunction with the ABS/DSC module, responsible for generating and maintaining adequate pressure in the brake circuits. In BMW E81, E87, and E90 vehicles, it is a key element for the cooperation between hydraulics and electronics, enabling:

• precise distribution of braking force to each wheel,
• stable ABS operation during sudden braking,
• cooperation with the DSC system for trajectory correction,
• maintenance of the factory brake pedal characteristics.

This provides the driver with predictable brake system response, which is particularly important in everyday use and in emergency situations.

Advantages of Using an Original BMW Master Cylinder

Using an original brake master cylinder integrated with the ABS/DSC system in BMW offers a range of practical installation and operational benefits. The component has been specifically designed for the brake system architecture of these generations, meaning:

• factory mounting points matched to the body and subframe,
• compatibility with factory brake lines and wiring harness,
• proper cooperation with the safety systems control unit,
• maintenance of original brake system operating parameters.

For workshops and users, this means a reduced risk of fitting issues and minimized installation and configuration time.

Professional Selection and Compatibility

To correctly select this master cylinder for a specific BMW model, it is advisable to pay attention to OEM markings and available replacement numbers – this allows verification of compatibility with the specific engine version and model year. The product has assigned reference numbers that facilitate identification in parts catalogs and service systems.

In practice, this means that with correct selection according to catalog numbers, the master cylinder can be used as a replacement part in various equipment variants, maintaining full ABS and DSC functionality without the need for installation modifications.

Condition, Verification, and Service Application

The offered brake master cylinder is a used component, which represents a cost-effective solution while maintaining the original manufacturer's specifications. This type of component is often chosen by BMW-specialized workshops and by discerning users who prefer OEM parts from disassembly over cheaper aftermarket alternatives with uncertain parameters.

Before installation, the standard service procedure is recommended, including checking system tightness, proper bleeding, and ABS/DSC system adaptation according to diagnostic procedures used in BMW. This approach allows for the full utilization of the part's potential and ensures stable brake system operation in the long term.

Braking System Expansion and Additional Materials

If you are planning a comprehensive repair or upgrade of the braking area in your BMW and need other parts from the same group, such as discs, pads, or brake lines, check the available parts in the Other BMW category.

To compare the characteristics of advanced braking systems and their role in high-performance cars, you can refer to a comparative material on sports models – you will find it in the article Audi RS vs. Other Models – What Lies Under the Hood and Chassis?, which discusses, among other things, the importance of appropriately selected brakes and accompanying components.