Big Father, Small Father at AMC Theatres-River East 21 This Weekend, Oct 16, 2015 (Friday) Festival event in Chicago, IL USA Big Father, Small Father October 16, 2015 at AMC Theatres-River East 21 in Chicago, IL 9:45PM.ind things to do this weekend in Illinois and other fun things to do.
In much the same way that vacuum boosters work, hydraulic power brake boosters rely on a pressure differential to provide braking assistance. The main difference is that it is hydraulic pressure that does the work rather than a vacuum-actuated servo.
Here is a step-by-step and somewhat simplified look at how brake fluid works within a hydraulic brake system: 1  The driver depresses the brake pedal. 2  The pedal compresses a piston inside the brake caliper. 3  This compression increases the pressure inside the brake lines and sends the brake fluid into motion.