Vehicle brake mechanism

Claim 1

A FLUID PRESSURE MOTOR MECHANISM COMPRISING A PRESSURE RESPONSIVE UNIT HAVING CHAMBERS AT OPPOSITE SIDES THEREOF, A MEMBER TO BE OPERATED CONNECTED TO SAID PRESSURE RESPONSIVE UNIT, A VALVE MECHANISM OPERABLE FOR CONTROLLING PRESSURES IN SAID CHAMBERS TO MOVE SAID PRESSURE RESPONSE UNIT BY ESTABLISHING DIFFERENTIAL PRESSURES IN SAID CHAMBERS, A PEDAL HAVING A FIRST NORMAL POSITION ENGAGING SAID VALVE MECHANISM AND FROM WHICH POSITION IT IS MOVABLE TO OPERATE SAID VALVE MECHANISM, AND NORMALLY INOPERATIVE PEDAL CONTROL MEANS CONNECTED TO SAID PEDAL AND OPERATIVE FOR MOVING SAID PEDAL TO A SECOND NORMAL POSITION, SAID PRESSURE RESPONSIVE UNIT COMPRISING RELATIVELY AXIALLY MOVABLE MEMBERS AND SPRING MEANS BETWEEN SUCH MEMBERS TENDING TO PUSH THEM APART AND OPERATE SAID PEDAL CONTROL MEANS, ONE OF SAID CHAMBERS NORMALLY BEING SUBJECT TO PRESSURE IN THE SOURCE TO MAINTAIN SAID SPRING MEANS COMPRESSED AND INOPERATIVE SO THAT UPON A FAILURE IN SUCH PRESSURE, SAID SPRING MEANS WILL EXPAND AND MOVE SAID PEDAL TO SAID SECOND POSITION WHEREBY SAID PEDAL WILL TRANSMIT FORCES THROUGH SAID PEDAL CONTROL MEANS AND THROUGH SAID SPRING MEANS TO OPERATE SAID MEMBER TO BE OPERATED.