BMW 335i Vacuum Pump

What does a vacuum pump do on a car?

A vacuum pump for a car is used to create or maintain vacuum pressure in various systems within the vehicle. One of the primary applications of a vacuum pump in a car is for the vacuum brake booster system. The auto vacuum pump assists in creating the necessary vacuum pressure to enable power brake assistance, making it easier for the driver to apply the brakes.

In some vehicles, automotive vacuum pumps are also used in other systems like the HVAC (heating, ventilation, and air conditioning) system, emission control system, and other components that require vacuum assistance for their proper functioning.

Types of vacuum pumps

There are primarily two types of vacuum pumps used in cars:

Mechanical Vacuum Pump: This type of car vacuum pump is driven by the engine's accessory belt. As the engine runs, it rotates the vacuum pump, creating vacuum pressure. Mechanical vacuum pumps are commonly used in older vehicles and some modern vehicles that rely on the engine's power to generate vacuum for various systems.

Electric Vacuum Pump: Electric vacuum pumps are powered by the vehicle's electrical system. They are more commonly found in modern cars, especially those equipped with turbochargers, superchargers, or hybrid/electric powertrains. Electric vacuum pumps provide an on-demand vacuum supply, which can be more efficient and adjustable compared to mechanical pumps.

Electric vacuum pumps are becoming more popular in newer vehicles due to their energy-efficient operation and the ability to tailor the vacuum supply to meet specific system demands. They are commonly used in applications like vacuum brake boosters, HVAC systems, emission control systems, and other engine management functions.