How do power brakes work? What is vacuum assist? How do brakes utilize a vacuum for added braking force? This video explains how a power brake system works, and how it reduces the amount of force a driver must use to slow down a vehicle.
Disc Brakes: http://www.youtube.com/watch?v=OjrY7G8o99U
Drum Brakes: http://www.youtube.com/watch?v=LX4mqzoe3BY
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