BMW 3 Series E90 E91 LCI N57 Vacuum Pipe Hose Line Brake Servo 7800726

The BMW 3 Series E90/E91 LCI N57 Brake Servo Vacuum Hose is an original brake system component from the hoses, pipes, and tubes category, designed to work with the N57 engine in the facelifted (LCI) version. It ensures stable vacuum delivery to the brake servo, which translates to predictable brake pedal response and safe vehicle operation.

Specifications and technical data

• SKU: rhd-7800726
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7800726
• Substitutable numbers: 34337800726, 7800726, AS
• Category: Hoses, Lines & Pipes

Purpose and Function in the Braking System

The offered vacuum hose is a component of the brake assist system in the BMW 3 Series E90/E91 generation after the facelift, equipped with the N57 engine. It is responsible for transporting vacuum from the pump to the brake servo, enabling proper power assistance and stable braking force under various engine load conditions.

Thanks to its factory-designed geometry and precise fit for the specific body and engine configuration, the hose maintains the correct routing within the engine bay, minimizing the risk of abrasion, kinks, or leaks.

Construction and Fitment for BMW 3 Series E90/E91 LCI N57

This hose was designed by BMW as part of the vacuum system dedicated to the N57 engine. Its appropriately selected inner diameter and shape ensure proper vacuum flow, and the integrated connectors allow for a secure, leak-free connection to the vacuum pump and brake servo.

Key installation features:

• factory fitment for the BMW 3 Series E90/E91 LCI braking system with the N57 engine,
• specifically shaped hose routing for easy installation in the engine bay,
• construction designed to withstand high temperatures and variable loads.

Condition, Origin, and Service Application

This part comes from the original BMW production line, meaning it retains factory operating parameters and compatibility with other brake system components. As a used part, it is a particularly attractive option for servicing vehicles where the vacuum hose has been damaged, brake assist effectiveness has decreased, or leaks have occurred in the system.

Replacing the vacuum hose is recommended, among other situations, when:

• the brake pedal feels hard when the engine is running,
• the braking system responds with a delay or unstably,
• mechanical damage, cracks, or oil traces are found on the existing hose.

Benefits of Using an Original BMW Hose

Using an original vacuum hose in the BMW 3 Series E90/E91 LCI N57 allows you to maintain brake system operating parameters in line with the manufacturer's specifications. Factory fitment reduces the risk of leaks, and the hose's appropriate stiffness and flexibility contribute to stable brake assist across the entire engine speed range.

For workshops and users, this means:

• certainty of compatibility with the specific model configuration,
• no need for modifications or fitting universal aftermarket parts,
• more predictable vehicle behavior during braking.

Other BMW Hoses, Pipes, and Tubes and a Buying Guide

If you are also looking for other BMW hoses, pipes, and tubes for your car, check out our dedicated category: BMW hoses, pipes, and tubes. There you will find a wide selection of brake, vacuum, and auxiliary system components tailored for various models of this brand.

When selecting a used vacuum hose or other brake system components, it is advisable to follow proven safety principles and compatibility verification. Practical tips can be found in our guide: Safe Online Purchase of Used Car Parts – A Step-by-Step Guide, which details a part selection strategy, including the use of OEM and reference numbers.