BMW 1 3 Series E81 E87N LCI E90 N47 Power Brake Servo Unit Vacuum Pipe 7800696

BMW 1 & 3 Series Brake Servo Vacuum Hose with N47 Engine is an original brake system component designed for models E81, E87N LCI, and E90. As part of the brake hoses, lines, and connectors group, it is responsible for the stable supply of vacuum to the servo, which translates to predictable brake assist operation and consistent pedal feel.

Specifications and technical data

• SKU: rhd-7800696
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 34337800696
• Substitutable numbers: 34337800696, 7800696
• Category: Brake Hoses, Lines & Fittings

Intended Use and Role in the Braking System

The offered vacuum hose is dedicated to BMW 1 and 3 Series E81, E87N LCI, and E90 vehicles with the N47 engine, where it works in conjunction with the brake servo. This component connects the vacuum pump to the servo, ensuring proper operating conditions for brake assist under typical road conditions.

A functional vacuum hose is crucial for:

• maintaining stable brake assist under various engine loads,
• limiting vacuum drops that can increase braking distance,
• preserving consistent brake pedal force.

Construction and Performance Characteristics

The hose belongs to the brake hoses, lines, and connectors category, meaning it is designed to operate in a vacuum environment and in proximity to engine bay heat sources. The hose's construction is adapted for factory routing in the E81/E87N LCI/E90 body, facilitating installation and minimizing the risk of collision with other components.

Its original BMW origin helps maintain the brake system's factory performance parameters and ensures proper fitment with the brake servo and vacuum pump. This reduces the risk of leaks that could occur with aftermarket replacements of different shapes or stiffness.

Condition, Selection, and Compatibility Check

This item is offered as a used part, allowing for economical brake system repair while maintaining the manufacturer's original specifications. Before installation, it is recommended to verify compatibility with the specific body version and engine, as well as to inspect other components of the vacuum circuit to avoid secondary leaks.

For easier identification, the hose has an assigned OEM part number and relevant interchange numbers, which can be verified in the manufacturer's catalog or service documentation. If in doubt, it is advisable to compare the hose's routing and mounting points with the currently installed part in your vehicle.

Brake System Safety and Operation

A functional brake servo vacuum hose directly impacts driving safety by ensuring proper brake assist. Symptoms such as a hard brake pedal, variable assist force, or a characteristic hissing sound in the engine bay may indicate a leak in this area and signal the need for hose replacement.

If you wish to delve deeper into selecting brake system components from the aftermarket, you may find the article describing how to safely choose used components like discs, calipers, or ABS modules useful – you can find it here: used brake system – how to safely select discs, calipers, and ABS.

Other BMW Brake Hoses, Lines, and Connectors

If you also need other BMW brake hoses, lines, and connectors for your car, check out our dedicated offer: BMW brake hoses, lines, and connectors. This will allow you to easily assemble the entire brake line section using components tailored to your model.