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.
Air brakes are used as an alternative to hydraulic brakes which are used on lighter vehicles such as automobiles. Hydraulic brakes use a liquid (hydraulic fluid) to transfer pressure from the brake pedal to the brake shoe to stop the vehicle. Air brakes have several advantages for large multitrailer vehicles: 1  The supply of air is unlimited, so the brake system can never run out of its operating fluid, as hydraulic brakes can.