BMW X3 G01 G20 G21 G28 G30 G31 G42 Vacuum Brake Servo Pipe Line Hose 5A09C59

The BMW X3 G01 G20 G21 G28 G30 G31 G42 Brake Booster Vacuum Hose 5A09C59 is a brake system component from the Brake Hoses, Lines, and Connectors group, designed for use in modern BMW X, 3, and 5 series models. It is responsible for the stable supply of vacuum to the brake booster, which translates to predictable brake pedal response and comfortable daily driving. This is a practical solution for users seeking a proven, used component with factory geometry and fitment.

Specifications and technical data

• SKU: 5A09C59
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 5A09C59
• Substitutable numbers: 5A09C59, 11665A09C59, 8664528, 11668664528
• Part type: Hose
• Category: Brake Hoses, Lines & Fittings

Purpose and Function in the Brake System

The brake booster vacuum hose in BMW X3 G01 and G20, G21, G28, G30, G31, and G42 series models is responsible for transferring vacuum from the engine unit to the brake booster. This provides the driver with assistance in applying pressure to the pedal, ensuring the entire braking system operates consistently and predictably. A properly selected hose minimizes the risk of power assist loss, uneven braking, or extended braking distances.

This component group is particularly important in vehicles subjected to intensive use – both in city traffic and on highways, where frequent braking generates high loads for the entire system. Using a hose with the correct shape and internal diameter allows for maintaining system operating parameters in line with the vehicle manufacturer's specifications.

Technical Characteristics and Fitment

The offered brake booster vacuum hose comes from the BMW line, which means it retains factory geometry, mounting points, and connector diameters. This ensures a straightforward installation without the need for modifications or additional adapters. The hose's construction is designed for resistance to vacuum, temperature fluctuations in the engine bay, and contact with typical operating fluids found around the engine unit.

In practice, this translates to:

• stable vacuum maintenance across the entire engine operating range,
• reduced risk of micro-cracks and leaks at critical bend points,
• secure connection to the booster and vacuum source ports.

Condition, Verification, and Service Application

The product is offered as a used part, allowing for economical brake system repair while maintaining original assembly specifications. This type of component is particularly useful in situations where the existing hose shows signs of wear, material hardening, leaks, or has been mechanically damaged during other service work in the engine bay.

Replacement of the brake booster vacuum hose is recommended, among other things, when symptoms such as a noticeably harder brake pedal, temporary loss of power assist, or audible hissing around the vacuum lines appear. Using an original BMW solution allows for restoring correct brake assist operation without altering the vehicle's construction.

Practical Workshop Application and Part Selection

The brake booster vacuum hose from this offer is intended for specific generations of BMW X3 and 3 and 5 series in G versions, which facilitates unambiguous selection based on vehicle data. In workshops specializing in the BMW brand, such an element is treated as a wear part that is worth inspecting during any major intervention in the engine bay or during brake system diagnostics.

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 flexible hoses, rigid pipes, or booster connectors, check the available parts in the category BMW Brake Hoses, Lines, and Connectors.

Safe Selection of Used Brake System Components

When choosing a used brake booster vacuum hose, pay attention to the overall surface condition, material flexibility, and the absence of visible damage at bend points and connections. It is also good practice to inspect other brake system components to avoid situations where a newly installed hose works with other, heavily worn parts.

If you want to streamline the process of selecting used brake components and learn practical tips for assessing their condition, the guide: Used Brake System: How to Safely Select Discs, Calipers, and ABS? will be useful. This is a helpful addition to your knowledge when planning a repair or upgrade of the brake system in your BMW.