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Hydraulic Brakes
Chapter 3 Hydraulic Fluids

Fluid Power - Intro to Hydraulics, Pneumatics, and how it all works
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automobiles  operates  in  a  way  similar  to  the system illustrated in figure 2-22. When  the  brake  pedal  is  depressed,  the pressure  on  the  brake  pedal  moves  the  piston within  the  master  cylinder,  forcing  the  brake  fluid from the master cylinder through the tubing and flexible  hose  to  the  wheel  cylinders.  The  wheel cylinders  contain  two  opposed  output  pistons, each of which is attached to a brake shoe fitted inside  the  brake  drum.  Each  output  piston  pushes the  attached  brake  shoe  against  the  wall  of  the brake  drum,  thus  retarding  the  rotation  of  the wheel. When pressure on the pedal is released, the springs  on  the  brake  shoes  return  the  wheel cylinder pistons to their released positions. This action  forces  the  displaced  brake  fluid  back through the flexible hose and tubing to the master cylinder. The force applied to the brake pedal produces a   proportional   force   on   each   of   the   output pistons,  which  in  turn  apply  the  brake  shoes frictionally   to   the   turning   wheels   to   retard rotation. As previously mentioned, the hydraulic brake system on most automobiles operates in a similar way,  as  shown  in  figure  2-22.  It  is  beyond  the scope of this manual to discuss the various brake systems. Figure  2-22.—An  automobile  brake  system. 2-17







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