Vehicle power brake mechanism

Claim 1

A FLUID PRESSURE POWER SYSTEM COMPRISING A MASTER MOTOR HAVING A FIRST PRESSURE RESPONSIVE UNIT AND A FIRST PRESSURE CHAMBER, A FIRST WORK-PERFORMING MEMBER CONNECTED TO SAID FIRST PRESSURE RESPONSIVE UNIT, A SLAVE MOTOR HAVING A SECOND PRESSURE RESPONSIVE UNIT AND A SECOND PRESSURE CHAMBER, A SECOND WORK-PEFORMING MEMBER CONNECTED TO SAID SECOND PRESSURE RESPONSIVE UNIT, A VALVE MECHANISM HAVING PARTS MOVABLE WITH SAID FIRST PRESSURE RESPONSIVE UNIT AND COOPERATIVE PARTS MOVABLE RELATIVE TO SUCH PRESSURE RESPONSIVE UNIT TO CONTROL COMMUNICATION BETWEEN SAID FIRST PRESSURE CHAMBER AND A SOURCE OF FLUID PRESSURE, THE PRESSURE CHAMBERS OF SAID MOTORS COMMUNICATING WITH EACH OTHER WHEREBY THE ADMISSION OF PRESSURE TO SAID FIRST PRESSURE CHAMBER ADMITS PRESSURE TO SAID SECOND PRESSURE CHAMBER, SAID FIRST PRESSURE RESPONSIVE UNIT BEING MOVABLE AT LEAST THROUGH A PREDETERMINED TRAVEL FROM A NORMAL OFF POSITION TO OPERATE SAID FIRST WORK-PERFORMING MEMBER, AND MEANS AUTOMATICALLY OPERATIVE UPON A FAILURE OF RESISTANCE TO MOVEMENT OF SAID FIRST WORK-PERFORMING MEMBER UNDER WHICH CONDITIONS SAID FIRST PRESSURE RESPONSIVE UNIT MOVES RELATIVELY FREELY FROM SAID OFF POSITION FOR LIMITING THE TRAVEL OF SUCH PRESSURE RESPONSIVE UNIT WHEREBY THE OPERATION OF SAID COOPERATIVE PARTS OF SAID VALVE MECHANISM WILL SUPPLY PRESSURE TO SAID FIRST PRESSURE CHAMBER AND THUS TO SAID SECOND PRESSURE CHAMBER TO OPERATE SAID SECOND WORK-PERFORMING MEMBER.