BMW Z4 E89 Roadster Cabrio Brake Servo Unit Master Cylinder 6799428

Description

BMW Z4 E89 Roadster Cabrio Brake Servo Unit Master Cylinder is a key component of the braking system, responsible for effectively assisting the pressure force on the brake pedal and ensuring stable pressure distribution within the system. This used component from the Brake Servos and Pressure Regulators group allows for a technically correct repair of the system, maintaining the operating characteristics intended for the BMW Z4 E89. It is a solution for users who expect a proven part with factory geometry and operating parameters.

Specifications and technical data

• SKU: 6799428
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6785916
• Substitutable numbers: 34336786750, 6786750, 34336786755, 6786755, 34326751589, 6751589, 34321165524, 1165524, 34321165529, 1165529, 6799428, AS
• Tire profile: 65535
• Category: Brake Servos

Purpose and function in the braking system

The BMW Z4 E89 Roadster Cabrio Brake Servo Unit Master Cylinder is responsible for braking force assistance and the stable transfer of pressure from the pedal to the hydraulic system. A correctly selected component ensures:

• appropriate brake pedal travel characteristics,
• repeatable pressure in the brake circuits,
• consistent operation with the brake pressure regulator and other system components.

By maintaining the factory design, the brake servo unit works with the vehicle’s electronics and braking system mechanics in accordance with the manufacturer’s specifications.

Benefits of using an original BMW component

Choosing a brake servo unit dedicated to the BMW Z4 E89 allows you to maintain consistency of safety parameters with the car’s factory configuration. The original design ensures:

• proper fitment to mounts and brake lines,
• compliance with factory brake pedal travel and leverage,
• the ability to use the existing system configuration without modifications.

A used element from this group is a good solution for vehicle maintenance where maintaining the original braking characteristics at reasonable repair costs is a priority.

Condition, verification, and installation aspects

The BMW Z4 E89 Roadster Cabrio Brake Servo Unit Master Cylinder offered is a dismantled part, which allows for the reuse of an original component in another vehicle. Before installation, standard service procedures are recommended, including:

• checking the vacuum system and hydraulic connections for leaks,
• verifying the correct operation of the brake pedal after bleeding the system,
• checking compatibility with existing brake lines and calipers.

This approach allows for the safe restoration of full braking system functionality while maintaining high consistency of operation.

Integration with other braking system components

The BMW Z4 E89 Roadster Cabrio Brake Servo Unit Master Cylinder works with discs, pads, lines, and the brake pressure regulator, creating a coherent system responsible for stopping the vehicle. A properly selected element from this group:

• maintains stable pressure in the circuits under various load conditions,
• supports even distribution of braking force between the axles,
• reduces the risk of uneven brake operation during emergency braking.

This is particularly important in sports-oriented cars such as the BMW Z4 E89, where the braking system operates under diverse operating conditions.

Expanding BMW braking system service

If you are planning a comprehensive repair or upgrade of the braking area in your BMW and need other elements from the same group, such as servos, brake pressure regulators, or related assistance components, check the available parts in the BMW Brake Servos and Pressure Regulators category.

During service work, it is also worth taking care of driving comfort, including the efficiency of air conditioning and heating. Practical tips on selecting used OEM components and maintenance schedules can be found in the article Air conditioning and heating – part selection and maintenance for year-round comfort, which helps you plan your car service in a consistent and predictable manner.