What does a vacuum pump do?
The vacuum pump aims to provide a vacuum to several different places in the engine bay. The booster on power brake systems is one of the critical components that require a vacuum.
The vacuum pump makes sure that the booster stays under constant vacuum to provide adequate braking force.
Emissions solenoids and turbocharger wastegate actuators also require a vacuum to perform as intended. If these parts dont receive a vacuum,
they wont function properly and trip a corresponding check engine light.