Vehicle braking system

Claim 1

IN A POWER BRAKE UNIT HAVING A FLUID PRESSURE DIFFERENTIAL RESPONSIVE POWER PISTON, A MASTER CYLINDER BORE FOR THE CONTAINMENT OF A HYDRAULIC BRAKE FLUID, A MASTER CYLINDER PISTON RECEIVED BY SAID BORE, A REACTION PISTON RECEIVED BY SAID MASTER CYLINDER PISTON VALVE MEANS OPENABLE FOR CREATING SAID PRESSUDE DIFFERENTIAL ACROSS SAID POWER PISTON FOR ACTUATION THEREOF, AND MANUAL MEANS FOR AT TIMES OPENING SAID VALVE MEANS FOR THE CREATION OF SAID PRESSURE DIFFERENTIAL, MEANS FOR CONNECTING SAID MASTER CYLINDER PISTON TO SAID POWER PISTON, SAID CONNECTING MEANS COMPRISING AN ADJUSTABLE MEMBER SECURED TO SAID POWER PISTON FOR MOVEMENT THEREWITH, A FIRST ABUTMENT SURFACE FORMED ON SAID ADJUSTABLE MEMBER NEAR ONE END THEREOF, AN ABUTMENT MEMBR CARRIED BY SAID MASTER CYLINDER PISTON AT ONE END THEREOF, A SECOND ABUTMENT SURFACE FORMED ON SAID ABUTMENT MEMBER ABUTTABLY ENGAGING SAID FIRST ABUTMENT SURFACE, SAID FIRST ABUTMENT SURFACE COMPRISING A CONICAL SEAT-LIKE PORTION AND SAID SECOND ABUTMENT SURFACE COMPRISING A SPHERICAL PORTION RECEIVED BY SAID CONICAL SEAT-LIKE PORTION FOR UNIVERSAL PIVOTAL ROTATION THEREIN, AN ANNULAR GROOVE FORMED GENERALLY INTERNALLY TO SAID ADJUSTABLE MEMBER, AN AXIALLY DIRECTED TUBULAR EXTENSION FORMED ON SAID ABUTMENT MEMBER SO AS TO BE GENERALLY LOOSELY RECEIVED WITHIN SAID ADJUSTABLE MEMBER, AN ANNULAR GROOVE FORMED IN SAID EXTENSION EXTERNALLY THEREOF, SAID EXTERNAL GROOVE BEING AXIALLY POSITIONED SO THAT SAID EXTERNAL GROOVE IS SLIGHTLY OUT OF JUXTAPOSITION WITH SAID INTERNAL GROOVE WHEN SAID RESPECTIVE ABUTMENT SURFACES ARE IN ENGAGEMENT WITH EACH OTHER, AND AN ANNULAR RESILIENT MEMBER PARTLY RECEIVED WITHIN EACH OF SAID GROOVES SO AS TO BE GENERALLY INTERPOSED BETWEEN SAID ADJUSTABLE MEMBER AND SAID EXTENSION FOR RESILIENTLY CONNECTING SAID ADJUSTABLE MEMBER AND SAID EXTENSION TO EACH OTHER AND TO CONTINUALLY URGE SAID RESPECTIVE ABUTMENT SURFACES INTO ENGAGEMENT WITH EACH OTHER.