BMW 1 3 SERIES E81 E87 E90 E90N E91 E92 E93 Brake Servo Unit 6775930

The BMW 1 and 3 Series E81, E87, E90, E90N, E91, E92, E93 Brake Servo Unit is an original BMW braking system component, designed for precise integration with the factory brake master cylinder and vehicle electronics. As part of the brake boosters and force regulators category, it ensures stable brake pedal assistance and predictable braking force modulation under typical operating conditions. This solution is intended for users who wish to maintain the factory braking system characteristics and compatibility with safety systems.

Specifications and technical data

• SKU: rhd-6775930
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6775930
• Substitutable numbers: 34332454368, 2454368, 34336779718, 6779718, 34336764122, 6764122, 6775930, KZ
• Category: Brake Servos

Purpose and Compatibility with BMW Models

The BMW 1 3 SERIES E81 E87 E90 E90N E91 E92 E93 Brake Servo Unit has been specifically developed for selected versions of the E-generation BMW 1 and 3 Series. The servo's design is adapted to the engine bay geometry of these models, facilitating installation and ensuring correct positioning relative to the brake pedal and master cylinder.

Its original BMW origin means that factory assistance parameters are maintained, which is particularly important for vehicles equipped with advanced safety systems such as ABS or stability control systems. This ensures that after replacing the servo, the brake pedal feel remains consistent with the manufacturer's specifications.

Technical Characteristics and Role in the Braking System

The brake servo plays a crucial role in converting the driver's foot pressure into effective braking force. This BMW component utilizes a vacuum-assisted design that works with the vacuum generated by the engine or a dedicated vacuum pump system. The appropriately selected internal gearing allows for:

• reduced effort required to press the brake pedal,
• more linear braking force modulation,
• maintaining a stable braking engagement point throughout its operating range.

As a component within the brake boosters and force regulators category, this unit works in conjunction with the brake force regulator and the vehicle's electronic systems, which is important for even brake force distribution between axles and maintaining vehicle stability during hard braking.

Benefits of Using an Original BMW Servo

Replacing a worn or faulty brake servo with an original BMW unit restores predictable braking system behavior. Key benefits include:

• Factory Fitment – maintaining correct mounting geometry, connection port positions, and mounting points, which minimizes the risk of leaks and brake pedal adjustment issues.
• Consistent Brake Pedal Feel – no undesirable changes in pedal hardness or travel after replacement, which is crucial for safety and driving comfort.
• Compatibility with Safety Systems – the servo works with factory traction control and stability systems, helping to ensure proper operation of emergency braking functions.

This used part is a sensible choice for users seeking OEM components in a more economical option, while retaining the original design and intended function.

Professional Installation and Brake System Diagnostics

Replacing the brake servo in BMW E-series models requires access to the engine bay, disconnection of the master cylinder, and components related to the brake pedal. Therefore, installation by a specialized service center is recommended, which will:

• check the vacuum system for leaks,
• verify correct pedal operation after installation,
• perform brake system bleeding according to the manufacturer's procedure.

When replacing the servo, it is advisable to inspect the condition of other braking system components, such as brake lines, the master cylinder, or the brake force regulator, to prevent the recurrence of braking performance issues.

More on the Operation of Auxiliary Components and Systems

If you are planning comprehensive vehicle maintenance, it is also worth paying attention to other systems that affect driving comfort and safety. In our guide on selecting and maintaining air conditioning and heating components in a car, you will find practical tips on the operation of OEM components, service schedules, and principles for choosing used parts, which may also be helpful when planning maintenance for systems related to the braking system.