BMW 1 3 5 7 Series E81 E87N E90 F10 R55 R56 Brake Servo Pressure Sensor 6786746

Description

BMW 1 3 5 7 Series E81 E87N E90 F10 R55 R56 Brake Servo Pressure Sensor is an original brake servo pressure sensor designed for selected BMW 1, 3, 5, and 7 Series models, as well as Mini R55/R56. This component works in conjunction with the braking system and vehicle electronics, ensuring precise pressure readings and stable operation of the brake booster. Thanks to its OEM factory design, it provides a consistent and trouble-free service solution for BMW vehicles.

Specifications and technical data

• SKU: 6786746-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6786746
• Substitutable numbers: 34336786746, 6786746, 34336875605, 6875605, 34336856290, 6856290, AS
• Category: Air Intake & Fuel Sensors

Purpose and function of the brake servo pressure sensor

The presented sensor is a component of the braking system responsible for monitoring pressure in the brake servo and transmitting information to the vehicle’s control units. A properly functioning sensor allows for:

• stable operation of the brake booster under various load conditions,
• precise modulation of braking force by the driver,
• correct interaction with safety systems such as ABS or traction control,
• reduction of errors and warning messages related to the braking system.

Due to its factory origin from the BMW group, the sensor is structurally matched for installation in 1, 3, 5, and 7 Series vehicles, as well as selected Mini models, which facilitates assembly and integration with the existing electrical harness.

Benefits of using an original BMW sensor

Using an original brake servo pressure sensor in BMW cars brings a number of practical service and operational benefits:

• Factory electrical and mechanical compatibility – correct connectors, threads, and mounting points, with no need for installation modifications.
• Consistent cooperation with brake control software and driver assistance systems.
• Reduced risk of diagnostic errors resulting from incorrect operating parameters of aftermarket replacements.
• The ability to utilize existing BMW service procedures and standard diagnostic tests.

As a result, the sensor is highly recommended for professional brake system repairs, where repeatability of parameters and compliance with manufacturer documentation are essential.

Product characteristics and condition

The offered item comes from the Air and fuel intake sensors group, but in practice, it functions as a pressure sensor in the brake servo system. This is a used part, which, in the case of electronics and brake equipment, allows for cost-effective repair while maintaining original BMW specifications. Before re-installation, it is recommended to perform a standard vacuum system leak test and verify the accuracy of readings during computer diagnostics.

Thanks to its original design, the sensor can be used as a direct replacement for the factory-installed component in many engine and body variants of the 1, 3, 5, and 7 Series, as well as selected Mini R55 and R56 models, in accordance with BMW service documentation.

Selection, installation, and service aspects

When selecting a brake servo pressure sensor for a specific BMW vehicle, it is crucial to compare catalog data and part numbers with the car’s documentation. In service practice, it is recommended to:

• verify compatibility with the part number and the list of interchangeable numbers in the BMW catalog or ETK system,
• check the brake system type and vehicle equipment version,
• inspect the condition of vacuum hoses and electrical connectors before installation.

The installation itself is usually simple and limited to removing the old sensor, replacing it in the same location, and connecting the electrical connector and vacuum hose. After installation, it is worth performing computer diagnostics, clearing any potential errors, and conducting a test drive to confirm the stable operation of the braking system.

If you are planning a comprehensive repair or upgrade of the area related to engine parameter measurement and the fuel system in your BMW and need other items from the same group, such as additional pressure sensors, temperature sensors, or air and fuel measurement elements, check the available parts in the BMW Air and fuel intake sensors category.

Used electronics and repair cost-effectiveness

In the case of sensors and other vehicle electronic components, choosing a used part can significantly reduce repair costs while maintaining original build quality. However, it is worth paying attention to the correct selection of the component, compatibility with control unit software, and the proper installation procedure. To better understand when purchasing used electronic components is a reasonable solution, it is worth reading our guide: The second life of electronics – when is it worth opting for used engine control units, comfort modules, and parking sensors?

Summary

BMW 1 3 5 7 Series E81 E87N E90 F10 R55 R56 Brake Servo Pressure Sensor is an original brake servo pressure sensor designed for selected BMW and Mini models, ensuring proper interaction with the braking system and vehicle electronics. Thanks to its factory design, compliance with BMW documentation, and compatibility with computer diagnostics, it represents a practical and technically consistent service solution for users seeking professional brake system repair.