Brake proportioning means

Claim 1

IN A BRAKE SYSTEM A MEANS TO PROPORTIONALLY VARY BRAKE FORCES OF ONE SET OF BRAKES IN ACCORDANCE WITH A FORCE APPLIED TO THE OTHER SET OF B RAKES, WHICH MEANS COMPRISES: A HOUSING HAVING A CHAMBER THEREIN WITH AN OUTLET AND AN INLET CONNECTION THEREWITH; A FIRST PRESSURE RESPONSIVE MEANS IN SAID CHAMBER WITH PASSAGE MEANS THERETHROUGH TO COMMUNICATED SAID INLET AND OUTLET CONNECTIONS; A VALVE MEANS CONTROLLING SAID PASSAGE MEANS, WHICH VALVE MEANS INCLUDES A SECOND PRESSURE RESPONSIVE MEMBER IN SAID CHAMBER ADJACENT SAID INLET CONNECTION THEREWITH SPACED FROM SAID FIRST PRESSURE RESPONSIVE MEANS, A VALVE OPERATIVELY CONNECTED TO SAID FIRST PRESSURE RESPONSIVE MEANS BY A SPRING, SAID VALVE HAVING A STEM FOR ENGAGEMENT WITH SAID SECOND PRESSURE RESPONSIVE MEMBER SUCH THAT, WHEN A PREDETERMINED PRESSURE IS REACHED AND SAID SECOND PRESSURE RESPONSIVE MEMBER IS MOVED AWAY FROM SAID STEM, SAID VALVE CLOSES SAID PASSAGE MEAN THROUGH SAID FIRST PRESSURE RESPONSIVE MEANS SO THAT SAID FIRST PRESSURE RESPONSIVE MEMBER IS CONTROLLED BY INLET PRESSURE; AND A MEANS TO DECREASE OUTLET PRESSURE AS A FUNCTION OF INLET PRESSURE.