hydraulic brake booster, particularly for motor

A PISTON BRAKE BOOSTER 8 IS MOUNTED IN THE BODY OF A 1 MASTER CYLINDER AND BRAKE is movable ROD PISTON 2 ON WHICH IS THE BRAKE PEDAL. FIRST VALVE 12, 20 ADMITS BRAKE FLUID FROM A TANK 41 HYDRAULIC OR BATTERY 45. A SECOND VALVE 26, 27 USED TO RETURN THE LIQUID. THE INVENTION CONCERNS MORE PARTICULARLY THE ACHIEVEMENT OF TWO VALVES AND COOPERATION SO AS TO IMPROVE THE PERFORMANCE BRAKE, SEALS AND EASY MANEUVER.