Hydraulic braking systems

Claim 1

AN HYDRAULIC BRAKING SYSTEM INCORPORATING A SOURCE OF FLUID UNDER PRESSURE, AT LEAST ONE BRAKE ACTUATING SLAVE CYLINDER, AND A PEDAL-OPERATED MASTER CYLINDER COMBINED WITH A VALVE CONTROLLING THE SUPPLY OF FLUID FROM SAID SOURCE TO SAID SLEEVE CYLINDER, SAID MASTER CYLINDER COMPRISING A CYLINDER BODY, A PISTON AXIALLY MOVABLE IN THE CYLINDER BORE, AN IMPERFORATE PEDAL-OPERATED ROD AXIALLY MOVABLE THROUGH SAID PISTON, A LOST-MOTION COUPLING BETWEEN SAID ROD AND PISTON PERMITTING A LIMITED AXIAL MOVEMENT OF THE ROD INDEPENDENTLY OF THE PISTON, A PRESSURE SPACE IN THE CYLINDER BORE IN FRONT OF THE BODY, A FIRST PASSAGE IN THE CYLINDER BODY ADAPTED TO BE CONNECTED TO SAID SOURCE AND OPENING INTO SAID PRESSURE SPACE, A NORMALLY CLOSED FIRST VALVE CONTROLLING SAID FIRST PASSAGE, A SECOND PASSAGE IN THE CYLINDER BODY ADAPTED TO BE CONNECTED TO A RESERVOIR AND LEADING INTO SAID PRESSURE SPACE, AND A NORMALLY OPEN SECOND VALVE CONTROLLING SAID SECOND PASSAGE, A SMALL FORWARD MOVEMENT OF SAID ROD CLOSING SAID SECOND VALVE AND OPENING SAID FIRST VALVE AND A GREATER MOVEMENT OF SAID ROD TAKING UP THE LOST MOTION BETWEEN THE ROD AND THE PISTON AND ADVANCING THE PISTON TO APPLY PRESSURE TO FLUID IN THE PRESSURE SPACE IN THE EVENT OF FAILURE OF THE SUPPLY OF PRESSURE FLUID.