Split system master cylinder

Claim 1

IN A MASTER CYLINDER CONSTRUCTION: A PAIR OF RESERVOIR MEANS SEGREGATED FROM EACH OTHER, A CYLINDER BORE, A FIRST PLUNGER SLIDINGLY AND SEALINGLY ENGAGING THE WALL OF ONE END PORTION OF SAID BORE, A SECOND PLUNGER SLIDINGLY AND SEALINGLY ENGAGING THE WALL OF THE OTHER END PORTION OF SAID BORE AND DISPOSED AT THE ADVANCED END OF SAID FIRST PLUNGER AND SPACED THEREFROM TO DEFINE A FIRST FLUID CHAMBER, SAID FIRST FLUID CHAMBER HAVING OUTLET PORT MEANS, SAID SECOND PLUNGER AND SAID OTHER END PORTION OF SAID BORE DEFINING A SECOND FLUID CHAMBER, SAID SECOND FLUID CHAMBER HAVING OUTLET PORT MEANS, SAID FLUID CHAMBERS EACH HAVING A COMPENSATING PORT COMMUNICATING WITH A RESPECTIVE ONE OF SAID RESERVOIR MEANS, SAID PLUNGERS EACH HAVING AN END SURFACE FACING EACH OTHER, AN ELONGATED MEMBER OPERATIVELY CONNECTED AT ONE END TO ONE OF SAID PLUNGERS AND EXTENDING AWAY FROM SAID END SURFACE OF SAID ONE PLUNGER TOWARD THE END SURFACE OF THE OTHER OF SAID PLUNGERS, AN ABUTMENT ON THE OTHER END OF SAID ELONGATED MEMBER, A SPRING RETAINER HAVING AN OPENING THEREIN SLIDABLY RECEIVING SAID ELONGATED MEMBER THERETHROUGH, SAID SPRING RETAINER HAVING AT LEAST A PORTION IMMEDIATELY ADJACENT SAID OPENING AND LOCATED AXIALLY BETWEEN SAID ABUTMENT AND SAID END SURFACE OF SAID ONE PLUNGER, A FIRST COIL SPRING SURROUNDING SAID ELONGATED MEMBER AND COMPRESSED BETWEEN SAID END SURFACE OF SAID ONE PLUNGER AND SAID SPRING RETAINER WITH ONE END OF SAID SPRING BEING OPERATIVELY CONNECTED TO SAID ONE PLUNGER AND THE OTHER END OF SAID SPRING ENGAGING ONE FACE OF SAID RETAINER TO URGE THE PORTION ON THE OTHER FACE OF SAID RETAINER WHICH IS IMMEDIATELY ADJACENT SAID OPENING INTO ENGAGEMENT WITH SAID ABUTMENT, SAID END SURFACE OF SAID OTHER PLUNGER COMPRISING AN ANNULAR SURFACE, SAID SPRING RETAINER TERMINATING IN AN ANNULAR SURFACE ABUTTING SAID ANNULAR SURFACE OF SAID OTHER PLUNGER, SAID OTHER PLUNGER HAVING AN ABUTMENT SURFACE ALIGNED WITH AND AXIALLY SPACED FROM SAID OTHER END OF SAID ELONGATED MEMBER AND AXIALLY SPACED FROM SAID ANNULAR SURFACE OF SAID OTHER PLUNGER FOR ENGAGEMENT BY SAID ELONGATED MEMBER WHEN SAID FIRST PLUNGER HAS ADVANCED AXIALLY A PREDETERMINED DISTANCE RELATIVE TO SAID SECOND PLUNGER, A SECOND COIL SPRING OF LESSER SPRING PRELOAD THAN SAID FIRST COIL SPRING LOCATED IN SAID SECOND FLUID CHAMBER AN ACTING ON SAID SECOND PLUNGER FOR EFFECTING ENGAGEMENT BETWEEN SAID OTHER PLUNGER AND SAID SPRING RETAINER AND THUS URGE SAID PLUNGERS AS A UNIT IN A DIRECTION AWAY FROM SAID OTHER END PORTION TOWARD SAID ONE END PORTION OF SAID BORE, STOP MEANS, SAID SECOND COIL SPRING FURTHER URGING ONE OF SAID PLUNGER INTO ENGAGEMENT WITH SAID STOP MEANS WHEREBY ENGAGEMENT THEREOF WILL DEFINE THE RETRACTED POSITION OF SAID PLUNGERS AS A UNIT, AND VALVE MEANS FOR COMMUNICATING EACH OF SAID COMPENSATING PORTS WITH THEIR RESPECTIVE RESERVOIR MEANS WHEN SAID PLUNGERS ARE IN RETRACTED POSITION AND CUTTING-OFF SAID COMMUNICATION WHEN SAID PLUNGERS ARE MOVED FROM THEIR RETRACTED POSITION.