Engine vacuum is used to reduce the amount of effort you need to press the brake pedal, for example. Some emissions control systems also rely on this negative pressure to prevent crankcase fumes ...

In power brake systems, which are found on virtually all ... Most brake boosters run on a vacuum produced by the engine. The cause of booster failure can be as simple as a loose vacuum hose ...

Vacuum leaks can develop in many locations, including the intake manifold, throttle body evaporative emissions system, power brake booster, and several other places, because some vehicles have a ...