How does the breaks of the car work?

How does the breaks of the car work?
There are 2 basic brake designs on most domestic vehicles. there are what they call "drum" and "disc" styles, the first generation was the drum style it used a hydraulic cylinder when the cylinder was pressurized it forced two pistons out (one on each side of the cylinder) against a pair of "shoes" which in turn pressed against the inside of the "drum" causing it to want to quit rotating causing a binding or braking action. once hydraulic pressure decreases a series of springs retract the "shoes" away from the drums.
disk brakes are the second generation of braking technology, they use a caliper and rotor setup the caliper sets over the rotor when the caliper is pressurized by brake fluid (stepping on the brake peddal) the caliper has a piston inside it that exerts a clamping force on the rotor wich in turn slows the rotor and wheel assembly. once the brake pressure is removed the piston retracts slightly letting the rotor free wheel again