Power Brakes - How do they Function?

Power assisted brakes (also known as power brakes) are brake systems designed with the intent of using lesser force to initiate a stronger braking power. Back in the day, when most cars had drum brakes, power brakes were not really necessary -- drum brakes naturally provide some of their own power assist. Since most cars today have disc brakes, at least on the front wheels, power brakes have become indispensable. Without this device, a lot of drivers would have very tired legs. How do they function?
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