Hydraulic fluid from tank 1 flows by gravity into pressure cylinder 2. When brake pedal 3 is depressed, cam 4 turns about fixed axis A and moves piston 5 to the left. Fluid forced out of the left end of cylinder 2 by piston 5 is delivered through pipeline 6 to operating cylinder 7, moving piston 8 to the right. Through lever 9, this applies tension to the brake band which brakes drum 10. When pedal 3 is released, spring 11 returns lever 9 and piston 8 to the initial position. Fluid from cylinder 7 is returned to pressure cylinder 2, returning piston 5 and pedal 3. Leakage of fluid from the system is automatically replenished by the flow of fluid from the tank through port a.
$4300$CHP,Br$