Brake Operation Depress the brake pedal, the slid valve Depress foot brake, the slid valve (2) (2) move to right and “a” is blocked and pushes booster piston (6) and “a” point is the pressure of B chamber is increased. closed. When the pressure of B chamber When the pressure of B chamber is increased to 20 kg/cm 2 , the overflow increases, the booster piston is moved to valve (1) is open and the oil is drained. right and contacts with “b” position of Release the pedal, the return spring (9) slid valve (8) and the slid valve is and (10) intake the brake oil back to oil pushed. tank.
When the slid valve (8) is pushed to right side, the piston (7) is pushed to right and the brake oil is compressed out from C chamber. 20-83