How are hydraulics used in car brakes?
As the brake pedal is pressed, an attached rod on the master cylinder applying pressure to the brake fluid in psi. This pressure is applied to the calipers/wheel cylinders clamping the brakes. In front brakes(disc/caliper) setups the pressure is multiplied. An example: Applying 100lbs of force to the master cylinder(not the pedal, since the pedal has a mechanical advantage of 5-7:1 meaning 20lbs or less on the pedal is 100 on the master cylinder). Because the master cylinder's piston has an area of 1 square inch(generalization) it would equal 100psi. 100psi of pressure on the caliper's piston which can have an area of around(say) 3inches, would exert 300psi of pressure on the pads.n disc drakes
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