BMW i3 I01 Hybrid Electrical Brake Booster Servo Vacuum Pump Unit 6857405

BMW i3 I01 Hybrid Electrical Brake Booster Servo Vacuum Pump Unit is an original BMW braking system component, responsible for generating vacuum and providing brake assistance in electric and hybrid vehicles. Thanks to its precise OEM design, the pump works in conjunction with the electronic brake booster, ensuring stable, predictable brake pedal operation and safe deceleration. This solution is intended for users who expect consistent braking system performance and the maintenance of factory vehicle parameters.

Specifications and technical data

• SKU: 6857405
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6857405
• Substitutable numbers: 34336857405, 6857405
• Category: Power Steering Pumps

Purpose and function in the BMW i3 I01 braking system

The presented electric vacuum pump works with the brake booster in the BMW i3 I01 model, where traditional vacuum sources (e.g., from an internal combustion engine) are limited or absent. This component is responsible for:

• stable vacuum generation for the brake booster,
• maintaining consistent assistance force regardless of system load,
• proper brake pedal response under various driving conditions,
• cooperation with safety systems such as ABS or ESP.

As a result, the driver receives consistent brake feel, which is important both in city traffic and during intensive use of regenerative and mechanical braking.

Construction and technical characteristics

The electric pump used in the BMW i3 I01 is designed as a brake assistance system component, working in close integration with the vehicle's electronics. The construction includes:

• an electric-driven vacuum pump assembly,
• a housing adapted for installation in the vehicle's technical compartment,
• connections allowing for integration with the car's vacuum and electrical systems.

This solution allows for precise control of brake assistance operation by the vehicle's control units, which is particularly important in electric cars where the braking system works in tandem with the energy recovery system.

Benefits of using an original assistance pump

Using an original pump from the Assistance Pumps group dedicated to the BMW i3 I01 allows for maintaining the parameters specified by the vehicle manufacturer. Key advantages include:

• retaining the factory brake pedal operating characteristics,
• proper cooperation with the braking system control electronics,
• correct mechanical and electrical fitment to the vehicle's installation,
• reduction of the risk of system errors and warning messages on the dashboard.

The component in used condition is a good solution for users looking for a technically sound part while optimizing service costs, while maintaining compliance with BMW factory specifications.

Selection by part numbers and vehicle integration

The pump is designed as an OEM component, meaning it has an assigned part number and interchangeable numbers, facilitating the selection of the correct element for a specific BMW i3 I01 configuration. When replacing, it is recommended to:

• verify compatibility by OEM part number and reference numbers,
• compare the shape of the housing and connections with the removed element,
• check installation requirements in the BMW service documentation.

This approach minimizes the risk of incorrect fitment and ensures seamless integration with the existing braking system.

Technical support and additional materials

When planning service work, it is worth using technical materials regarding diagnostics and selecting elements by OEM numbers. Detailed information on part identification methods, service procedures, and practical tips can be found in the article: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which discusses, among other things, best practices for working with catalog numbers and technical documentation.

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 vacuum pumps, hydraulic pumps, or electric assistance modules, check the available parts in the BMW Assistance Pumps category.

Summary

BMW i3 I01 Hybrid Electrical Brake Booster Servo Vacuum Pump Unit is a specialized braking system component, designed to work with the electric brake booster in BMW i3 I01 vehicles. The original OEM design ensures proper fitment, compatibility with vehicle electronics, and predictable brake assistance operation. Choosing this pump is a solution for users who want to maintain safety and functionality of the braking system at a level consistent with the manufacturer's specifications.