Hydraulic braking system having improved stability

Claim 1

IN AN AUTOMOTIVE BRAKING SYSTEM HAVING LEFT AND RIGHT WHEEL BRAKING STRUCTURES EACH OF WHICH INCLUDE PRIMARY AND SECONDARY SHOES, A ROTATING DRUM STRUCTURE ENGAGED BY THE SHOES, PRIMARY AND SECONDARY FLUID PRESSURE MOTORS RESPECTIVE ONES OF WHICH FORCE THE LEADING EDGE OF THE PRIMARY SHOE AND THE TRAILING EDGE OF SAID SECONDARY SHOE INTO ENGAGEMENT WITH SAID DRUM STRUCTURE, AND A LINK TRANSFERRING SERVOACTION TORQUE FORCES FROM SAID PRIMARY SHOE TO THE LEADING END OF SAID SECONDARY SHOE: CONTROL MEANS OPERATIVELY CONNECTED TO SAID PRIMARY AND SECONDARY FLUID PRESSURE MOTORS FOR DEVELOPING A MODULATED PRESSURE; VALVE MEANS OPERATIVELY CONNECTED BETWEEN SAID CONTROL MEANS AND SAID FLUID PRESSURE MOTORS FOR INITIALLY SUPPLYING FLUID FROM SAID CONTROL MEANS TO EACH OF SAID FLUID PRESSURE MOTORS, AND TO THEREAFTER ISOLATE FLUID IN SAID SECONDARY FLUID PRESSURE MOTORS FROM SAID CONTROL MEANS; BALANCING MEANS IN FLUID COMMUNICATION WITH SAID CONTROL MEANS AND SAID FLUID PRESSURE MOTORS, SAID BALANCING MEANS HAVING OPPOSIING FLUID DISPLACEMENT CHAMBERS TO WHICH PRESSURE FROM SAID ISOLATED SECONDARY FLUID PRESSURE MOTORS ARE RESPECTIVELY COMMUNICATED; OPPOSING MOVABLE WALLS IN SAID RESPECTIVE FLUID DISPLACEMENT CHAMBERS; AND VALVE MEANS CONTROLLED BY MOVEMENT OF SAID OPPOSING MOVABLE WALLS FOR CLOSING OFF COMMUNICATION FROM SAID CONTROL MEANS TO THE PRIMARY FLUID PRESSURE MOTOR OF THE BRAKE STRUCTURE HAVING THE GREATEST PRESSURE IN ITS SECONDARY FLUID PRESSURE MOTOR.