When the brake pedal is released, the pistons are returned to theiroriginal position by hydraulic pressure and the force of the returnsprings. However, because the brake fluid does not return to themaster cylinder immediately, the hydraulic pressure inside the cylinderdrops momentarily. As a result, the brake fluid inside the reservoirtank flows into the cylinder via the inlet port, through small holesprovided at the front of the piston, and around the piston cup. Thisdesign prevents vacuum from developing and allowing air to enter atthe wheel cylinders.
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