Load adjusted brake control means for vehicles

Claim 1

BRAKE CONTROL MEANS COMPRISING: A HOUSING; AN INLET AND AN OUTLET FOR FLUID IN SAID HOUSING; A VALVE ASSEMBLY ACTUABLE TO CONTROL FLUID FLOW BETWEEN SAID INLET AND OUTLET; PRESSURE-RESPONSIVE MEANS WITHIN SAID HOUSING COMPRISING FIRST AND SECOND RELATIVELY MOVABLE PARTS ACTUABLE, IN RESPONSE TO THE PRESSURE OF OUTLET FLUID, TO EXERT A FIRST AND SECOND FORCE ON SAID VALVE ASSEMBLY; VARIABLE MECHANICAL ADVANTAGE MECHANISM; MEANS OPERABLE TO VARY THE MECHANICAL ADVANTAGE OF SAID MECHANISM IN ACCORDANCE WITH CHANGES IN THE LOADING ON A VEHICLE AXLE; A MEMBER ACTUABLE BY SIGNAL PRESSURE TO EXERT ON SAID VALVE ASSEMBLY A THIRD FORCE IN OPPOSITION TO SAID FIRST AND SECOND FORCES, SAID THIRD FORCE ACTING THROUGH SAID VARIABLE MECHANICAL ADVANTAGE MECHANISM; ABUTMENT MEANS; AND RESILIENT MEANS BIASING SAID SECOND PART OF SAID PRESSURE-RESPONSIVE MEANS IN OPPOSITION TO SAID OUTLET PRESSURE TOWARDS A FIRST CONFIGURATION IN ENGAGEMENT WITH SAID ABUTMENT MEANS IN WHICH ONLY SAID FIRST PART OF SAID PRESSURE-RESPONSIVE MEANS ACTS ON SAID VALVE ASSEMBLY, SAID RESILIENT MEANS BEING YIELDABLE TO ALLOW SAID SECOND PART OF SAID PRESSURERESPONSIVE MEANS TO MOVE TO A SECOND CONFIGURATION IN WHICH SAID SECOND PART OF SAID PRESSURE-RESPONSIVE MEANS ACTS ON SAID VALVE ASSEMBLY.