CHECK VALVE Or ONE WAY VALVE

    IN THIS VALVE  of  ONE SIDE AND OTHER SIDE gives SMALL HOLE,              AFTER THE BREAK OPERATE  
            BREAK OIL WHEN IT HAPPEN          PASSED FROM CHECK VALVE HOLE COMES OUTSIDE 
IN THIS TIME  OIL PRESSURE  GETS IT MORE  
WHEN GETS IT BRAKE   RELEASE   
  AT THAT TIME COMES BACK FROM CYLINDER AT THAT TIME ONLY CHECK VALVE LEAVING THEIR PLACE AND LEAVING BEHIND AND THIS WAY COMES OIL IN CYLINDER