how a brake booster works
How a vacuum brake booster works. A vacuum brake booster provides power assist to the brake system. As anyone who has experience a booster failure knows, the booster greatly reduces the effort required to stop the vehicle.Brake booster problems misdiagnosed, often set off a series of expensive events.eedlessly replacing a good booster often occurs. To function properly, the brake booster needs a good source of a vacuum. The lack of a vacuum is more common than brake booster failure, when we have no power assist.