Brake Servo BMW X3 G01 X4 G02 Unit Master Cylinder Booster Petrol 8074223

Brake Servo BMW X3 G01 X4 G02 Unit Master Cylinder Booster Petrol is a component from the Brake servos and brake force regulators category, designed for braking systems in vehicles with petrol engines. This used OEM part ensures factory-standard assistance characteristics, which translates into predictable brake pedal response and stable vehicle behavior during daily operation.

Specifications and technical data

• SKU: 8092745
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8092745
• Substitutable numbers: 8092745, 34338092745, 6881616, 34336881616, 6871185, 34336871185, 8074223
• Fuel type: Petrol
• Tire profile: 65535
• Category: Brake Servos

Purpose and function in the braking system

The brake servo with master cylinder in BMW X3 G01 and X4 G02 models is responsible for increasing the force applied to the main brake system piston without the need for harder pedal pressure. Combined with the master cylinder, it forms a unit that:

• stabilizes pressure in the brake circuits during emergency braking,
• ensures repeatable pedal operation characteristics,
• works in conjunction with safety systems such as ABS or traction control.

Thanks to this, the driver receives a predictable response from the braking system, which is important both in city traffic and at higher speeds.

Compatibility with petrol units

The presented brake servo with master cylinder has been designed to work with petrol engines, which means it is matched to the vacuum characteristics generated by these types of units. In practice, this translates into:

• proper assistance across the full engine RPM range,
• consistent operation with factory brake controller calibration,
• maintenance of original BMW braking system performance parameters.

Selecting a component compatible with the fuel type is crucial for maintaining proper assistance operation and avoiding irregularities in brake pedal performance.

OEM part characteristics and condition

As a BMW OEM brand component, the brake servo with master cylinder retains factory mounting points and the geometry of hydraulic and vacuum connections. This facilitates installation in place of the existing unit without the need for system modifications or additional adapters. The used nature of the part allows for economical repair while maintaining the manufacturer's original specifications.

Choosing an original component from this group minimizes the risk of compatibility issues and limits the need for recalibration of brake assistance systems. This is a particularly beneficial solution for servicing vehicles used intensively, where parameter repeatability and predictable system behavior are essential.

Importance for safety and driving comfort

A functional brake servo with master cylinder has a direct impact on braking distance and pedal operation comfort. A properly selected and functioning unit:

• reduces the effort required to achieve full braking force,
• ensures linear, easy-to-feel pedal operation,
• supports the operation of vehicle stability control systems.

Thanks to this, the driver can more precisely modulate braking force, which is important both in emergency situations and during daily driving in changing road conditions.

Expansion and service of the BMW braking zone

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, brake force regulators, or related hydraulic components, check the available parts in the BMW brake servos and brake force regulators category.

When planning broader service work, it is also worth taking care of systems that affect driving comfort, such as 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 will help you consistently plan the maintenance of key systems in your car.