BMW 1 3 Series E87 E90 E91 ABS DSC Module Pump ECU Hydro Unit 6769779 6791521

The BMW E87 E90 ABS Brake Booster is an original part from the ABS & ESP System category, designed for professional repair and restoration of the full functionality of the braking system in BMW 1 Series E87 and 3 Series E90 vehicles. This solution is for users who expect factory fitment, stable ABS/ESP system operation, and maintenance of safety parameters as intended by the manufacturer.

Specifications and technical data

• SKU: 6794646
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6794646
• Substitutable numbers: 34516794646, 6794646, 34516791521, 6791521, 34526769779, 6769779, 34516770590, 6770590, 34516774071, 6774071, 34516771693, 6771693, 34512460450, 2460450
• Category: ABS & Stability Hydraulic Units

Intended Use and Function in the ABS & ESP System

The presented ABS brake booster is responsible for precise control of pressure in the brake circuits and cooperation with the driving stability control electronics. In practice, this means:

• effective prevention of wheel lock-up during sudden braking,
• cooperation with the traction control and driving stability system,
• maintaining predictable, repeatable vehicle behavior in emergency situations.

Thanks to its factory design, the booster is matched to the characteristics of the BMW E87 and E90 braking system, which facilitates installation and reduces the risk of compatibility issues.

Original Origin and Interchangeable Numbers

The part comes from the BMW OE line, which means adherence to the vehicle manufacturer's quality standards. The booster has a dedicated OEM part number and assigned interchangeable numbers, which facilitate the selection of the correct component for a specific car configuration. This allows for conscious verification of compatibility with your model by comparing the designations in the technical specifications with the numbers on the old booster.

The presence of reference numbers in the technical data also allows for easier consultation with a mechanic or service advisor, minimizing the risk of purchasing an incorrect part.

Condition, Origin, and Benefits of Choosing a Used Part

The ABS booster is a used part, sourced from disassembly, offering a sensible compromise between repair cost and maintaining original quality. Compared to cheaper, low-quality aftermarket alternatives, an original BMW OE component ensures:

• factory fitment to the vehicle's hydraulic and electrical systems,
• maintenance of operating parameters as intended by the manufacturer,
• greater predictability of operation in the long term.

Choosing a used ABS booster is particularly beneficial for repairing older BMW models where both safety and cost-effectiveness of servicing are important.

Professional Installation and System Diagnostics

To fully utilize the potential of this booster, installation in a specialized workshop equipped with appropriate diagnostic software for BMW is recommended. After installation, it is necessary to:

• bleed the braking system according to the service procedure,
• adapt or code the module (if required for the specific car configuration),
• check for errors in the ABS/ESP control unit and perform a test drive.

Properly performed installation restores the full functionality of active safety systems and ensures stable braking system operation in daily use.

BMW ABS & ESP System – Practical Knowledge

If you want to better understand how individual modules in a car work together, including components responsible for vehicle handling and stability, it's worth referring to our guide. In the article “Steering System and Power Steering – How it Works and What Fails?”, you will find practical information on diagnostics, fault symptoms, and examples of using used parts.

Other BMW ABS & ESP System Components

If you are also looking for other components from the ABS & ESP System category dedicated to this brand, check out the BMW ABS & ESP System available in our store. This will allow you to select cohesive, original parts for a complete repair or upgrade of your car's braking system.