BMW 1 3 Series 1 E87 E90 E91 M47N2 Diesel Power Brake Vacuum Pipe Hose 7797256

BMW 1 3 Series 1 E87 E90 E91 M47N2 Diesel Power Brake Vacuum Pipe Hose is an original brake system component designed for 1 Series E87 and 3 Series E90 / E91 models with the M47N2 engine. It ensures stable vacuum supply to the brake booster, which translates into predictable brake assist performance and safe deceleration. Thanks to its factory geometry and connectors, the hose is perfectly matched to the original vacuum system in these BMW models.

Specifications and technical data

• SKU: rhd-7797256-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7797256
• Substitutable numbers: 11667797256, 7797256, 34337802676, 7802676, 34336766087, 6766087
• Fuel type: Diesel
• Category: Other Engine Parts

Application in the BMW brake system

The presented vacuum hose is a component connecting the diesel engine's vacuum system to the brake booster. In a diesel engine, where there is no classic vacuum from the throttle, a properly selected hose is crucial for:

• maintaining the appropriate vacuum level in the brake booster,
• stable brake pedal assist force,
• repeatable brake system response under various engine load conditions.

Thanks to a design consistent with BMW factory standards, the hose works with the M47N2 diesel system, maintaining proper rigidity and resistance to temperature and vibrations in the engine bay.

Construction and technical fitment

The BMW 1 3 Series 1 E87 E90 E91 M47N2 Diesel Power Brake Vacuum Pipe Hose has been designed as a component with a precisely selected inner diameter and shape, which minimizes pressure drops in the section between the vacuum source and the booster. Properly formed sections and factory connection ends facilitate installation in the original brackets and sockets on the power unit and at the booster.

This solution allows for maintaining:

• proper vacuum flow without turbulence,
• resistance to hose kinking during power unit movement,
• stability of connections during long-term operation.

Benefits of using an original hose

Using an original vacuum hose in BMW 1 and 3 Series diesel models brings measurable operational benefits. Factory fitment to the brake system reduces the risk of leaks, which could result in a hard brake pedal or increased braking distance. At the same time, compatibility with other vacuum system components is maintained, which facilitates diagnostics and service.

The element from this group is particularly important in vehicles used in city traffic, where frequent braking requires stable assistance. A properly selected vacuum hose helps maintain repeatable brake pedal feel and improves driving comfort.

Condition and characteristics of the used product

The offered vacuum hose is a used part, sourced from a dismantled BMW vehicle. This type of part, provided it remains airtight and free of mechanical damage, can be successfully used as a replacement in vehicles where the original hose has worn out or been damaged. Choosing a used component allows for reducing repair costs while maintaining compliance with factory specifications.

Before installation, it is recommended to perform a standard inspection of the hose's external condition, particularly for any cracks, abrasions, and the quality of the connectors, to ensure full vacuum system integrity.

Compatibility and part selection

The hose has been designed specifically for BMW 1 Series E87 and 3 Series E90 / E91 models with the M47N2 diesel engine, which means its geometry and routing correspond to the factory solutions used by the manufacturer. In practice, this facilitates installation and reduces the risk of collision with other components in the engine bay.

For proper part selection, it is worth using the manufacturer's markings and interchangeable numbers, which are listed in the product's technical specification. This allows for verifying compatibility with a specific engine version and vehicle model year.

If you are planning a comprehensive repair or upgrade of the brake zone in your BMW and need other elements from the same group, such as vacuum lines, flexible hoses, or additional mounting elements, check the available parts in the Other BMW category.

Technical knowledge and brake system development

Modern brake systems in premium cars, such as BMW or Audi, increasingly work with advanced electronic stability control and traction control systems. For those interested in comparing solutions used in different brands, including sports models, material discussing differences in engine, brake, and chassis construction may be useful. In this context, it is worth reading the article Audi RS vs other models – what is hidden under the hood and chassis?, which shows how manufacturers combine the power of the engine with a properly designed brake system.