BMW 3 Series E46 1 Brake Servo Unit Master Cylinder Expansion Tank 6755278

BMW 3 Series E46 brake booster with master cylinder and reservoir is an original BMW braking system component designed for 3 Series E46 models. The complete booster, master cylinder, and reservoir assembly ensures stable braking assistance, proper brake force modulation, and compatibility with your BMW's factory system architecture, facilitating service and diagnostics.

Specifications and technical data

• SKU: 6755278-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6755278
• Substitutable numbers: 34336779682 34336785666 34326750798 6755278, 6779682 6785666 6750798, 34336756851 34331164076 34316763670 34316770917, 34336779680 34316776002 34316752540, 6756851 1164076 6763670, 6770917 6779680 6776002, 6752540, PK
• Category: Brake Servos

Application and Function in the Braking System

The presented assembly belongs to the Brake Boosters and Force Correctors group, responsible for proper brake pedal assistance and appropriate brake force distribution between axles. Integrating the booster with the master cylinder and fluid reservoir reduces the number of connections, promoting system sealing and simplifying installation in the engine bay of the BMW 3 Series E46.

The original BMW design ensures compatibility with factory mountings, pedal geometry, and brake lines, so after correct installation, the system will retain parameters close to the factory configuration.

Benefits of Using an Original BMW Assembly

Using the complete booster assembly with master cylinder and reservoir in the BMW 3 Series E46 allows you to:

• maintain consistency with the factory BMW braking system,
• preserve predictable, repeatable brake pedal action,
• reduce the risk of issues with thread and hose fitting compatibility,
• simplify brake system bleeding and servicing.

The component comes from the BMW parts group, which promotes proper fitment for specific engine and equipment versions within the 3 Series E46, while maintaining compatibility with factory brake force correctors.

Condition, Installation, and Service Aspects

The offered assembly is used, allowing for economical repair of the braking system while preserving the original BMW design. Before installation, the standard service procedure is recommended: leak testing, verification of vacuum booster operation, checking the condition of the fittings, and replacing the brake fluid according to the vehicle manufacturer's recommendations.

The complete booster assembly with master cylinder and reservoir simplifies the mechanic's work – disassembly and assembly are performed as a single unit, reducing service time and the risk of errors related to mixing different component versions.

Selection, Reference Numbers, and Compatibility

The component has a factory BMW part number and associated replacement numbers, which facilitates precise identification by VIN or manufacturer markings. This allows for verification of compatibility with a specific BMW 3 Series E46 version, avoiding problems with the installation and operation of the braking system.

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 additional boosters, brake force correctors, or complete master cylinder assemblies, check the available parts in the BMW Brake Boosters and Force Correctors category.

Technical Support and Service Knowledge

When working on the braking system, it is also worth considering the condition of other components affecting driving safety and comfort, such as the suspension or the air conditioning and heating system, which share the same service area of the vehicle. To better plan year-round car maintenance, you can use the advice contained in the article Air Conditioning and Heating – Parts Selection and Maintenance for Year-Round Comfort.

If you are considering when it is worthwhile to opt for an original part, an aftermarket replacement, or a used part in the context of a BMW braking system repair, the cost-technical guide Original, Aftermarket, or Used – Which Car Parts Offer the Best Value? will be helpful, discussing the differences in quality, fitment, and cost-effectiveness of various solutions.