Liquid pressure braking systems for vehicles

Claim 1

A LIQUID BRAKING SYSTEM OF THE HYDROSTATIC TYPE WHEREIN THERE IS PROVIDED A MASTER CYLINDER AND A BRAKE OPERATING MOTOR CYLINDER WITH A BRAKE OPERATED BY SAID MOTOR CYLINDER, A SERVO DEVICE INCLUDING A HOUSING, DIAPHRAGM MEANS IN SAID HOUSING DIVIDING IT INTO A HIGH PRESSURE AND A LOWER PRESSURE CHAMBE, A CUP SHAPED MEMBER DISPOSED CENTRALLY OF SAID DIAPHRAGM MEANS, A LIQUID CHAMBER DISPOSED CENTRALLY OF SAID CUP MEMBER, A FIRST CONDUIT IN COMMUNICATION WITH SAID MASTER CYLINDER AND LIQUID CHAMBER, A SECOND CONDUIT IN COMMUNICATION WITH SAID LIQUID CHAMBER AND MOTOR CYLINDER, A NON-RETURN VALVE ADJACENT SAID LIQUID CHAMBER FOR CUTTING OFF CUMMINICATION BETWEEN SAID FIRST CONDUIT AND MASTER CYLINDER AND SAID SECOND CONDUIT AND MOTOR CYLINDER, A SLIDABLE PLUNGER IN SAID LIQUID CHAMBER ADAPTED TO UNSEAT SAID VALVE, SAID CUP MEMBER BEING DISPOSED TO ACTUATE SAID PLUNGER TO MAINTAIN SAID VALVE UNSEATED, BIASING MEANS NORMALLY URGING SAID CUP MEMBER AGAINST SAID PLUNGER, A BY-PASS VALVE IN SAID DIAPHRAGM MEANS IN COMMUNICATION WITH SAID HIGH AND LOW PRESSURE CHAMBERS, AND BY-PASS VALVE OPEN HIGH MEANS NORMALLY MAINTAINING SAID BY-PASS VALVE OPEN WHEN SAID BRAKING SYSTEM IS IN A NON-BRAKING APPLICATION, SAID PLUNGER BEING DISPOSED TO CLOSE SAID BY-PASS VALVE WHEN LIQUID PRESSURE IN SAID FIRST CONDUIT AND LIQUID CHAMBER INCREASES ABOVE A PREDETERMINED VALUE DUE TO A BRAKING APPLICATION, AND A SENSING DEVICE OPERATIVELY CONNECTED TO SAID HIGH PRESSURE CHAMBER TO SUPPLY AIR UNDER PRESSURE THERETO WHEN THE DECELERATION OF A WHEEL EXCEEDS A PREDETERMINED RATE.