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Brake pistons are actuated by either fluid or air pressure. As you depress the brake pedal, the increase in pressure in the brake line expands the flexible end of the brake line, located in the brake caliper. As the pressure increases, it forces the brake piston to move within the caliper, putting pressure on the brake disk, and slowing its rotation, slowing the vehicle. As the brake pedal is released, it creates a vacuum in the system that causes the piston to relax and free the disk to spin again,
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