BMW 1 3 Series E81 E87 E88 E90 E91 E92 Brake Servo Unit Master Cylinder 6779718

BMW 1 3 Series E81 E87 E88 E90 E91 E92 Brake Servo Unit Master Cylinder integrated with the brake master cylinder is a key component of the braking system, responsible for the stable transfer of pedal pressure into pressure within the brake circuits. The offered set from the Brake Servos and Proportioning Valves category comes from the original BMW line and is intended for use in selected models of the 1 and 3 series, generations E8x and E9x. This is a solution for users who expect precise braking system performance while maintaining factory operating characteristics.

Specifications and technical data

• SKU: rhd-6779718
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6779718
• Substitutable numbers: 34336779718, 6779718, 6759450, 34336785663, 6785663, 34326764117, 6764117, 34336764122, 6764122, 34336779719, 6779719, 34316764124, 6764124, 34332454368, 2454368
• Category: Brake Servos

Purpose and function in the braking system

The presented brake servo unit with master cylinder has been designed specifically for BMW 1 and 3 series vehicles of the E81, E87, E88, E90, E91, and E92 generations. Its task is to boost braking force while maintaining a linear, predictable pedal response. Thanks to the use of the original BMW design, this component works in harmony with the factory brake master cylinder, brake lines, and vehicle control modules.

The brake servo and proportioning valve are responsible for:

• assisting brake pedal pressure using vacuum from the engine or vacuum system,
• stable metering of pressure in the front and rear axle brake circuits,
• maintaining repeatable braking characteristics under various vehicle load conditions.

Benefits of using the original brake servo unit

Using the original brake servo unit with master cylinder in a BMW 1 or 3 series allows for maintaining the factory parameters of the braking system. Precise fitment for the specific E8x/E9x platform reduces the risk of installation issues and eliminates the need for system modifications. The system maintains proper cooperation with safety systems, such as ABS or stability control, which translates into predictable vehicle behavior during heavy braking.

For the user, this means:

• consistent, repeatable brake pedal feel,
• effective transfer of braking force to all wheels,
• maintaining braking characteristics in accordance with the vehicle manufacturer's specifications.

Performance characteristics and installation

The offered element from the Brake Servos and Proportioning Valves group is a solution intended for direct installation in the appropriate versions of the BMW 1 and 3 series. The design provides for compatibility with factory mounts on the bulkhead and the original pedal assembly. This allows for maintaining the correct geometry of the brake pedal operation and full system functionality.

During replacement, it is recommended to:

• check the tightness of brake lines and connections at the master cylinder,
• bleed the braking system in accordance with the service procedure for the given BMW generation,
• verify the correctness of pedal travel and system response after installation.

Condition and use in vehicle service

The item is offered in used condition, which allows for an economical repair of the braking system while maintaining the manufacturer's original specifications. This type of component is suitable both for standard replacement of a worn-out servo and for comprehensive rebuilding of the braking system after a failure. Selecting parts from the same functional group enables maintaining the consistency of the entire system's operating parameters.

If you are planning a comprehensive repair or upgrade of the braking zone in your BMW and need other elements from the same group, such as servos, proportioning valves, or complete power brake units, check the available parts in the BMW Brake Servos and Proportioning Valves category.

Technical support and additional knowledge

When performing service work on the braking system and other comfort and safety systems in the vehicle, it is worth using reliable sources of knowledge. In the context of maintaining vehicle efficiency, including systems responsible for driving comfort, an article describing the selection and operation of components responsible for cabin conditions may be helpful – you can find it here: Air conditioning and heating – part selection and maintenance for year-round comfort.

If you operate a BMW with a diesel engine and are analyzing maintenance costs and the availability of aftermarket parts, additional information on the characteristics of power units and their maintenance will be provided by the entry: BMW N47 vs M57 / M57N / M57N2 – ranking of legendary diesels: performance, reliability, and aftermarket parts costs.