Power operated master cylinder

Claim 1

A FLUID PRESSURE DEVELOPING UNIT COMPRISING: A HOUSING HAVING A PRIMARY FLUID PRESSURE CHAMBER AND AT LEAST ONE SECONDARY FLUID PRESSURE CHAMBER, WHICH CHAMBERS ARE DIVIDED INTO VARIABLE VOLUME CHAMBERS BY RESPECTIVE PRIMARY AND SECONDARY MOVABLE WALLS; A SERVOMOTOR MEANS INCLUDING A CONTROL DEVICE; PASSAGE MEANS FOR SIMULTANEOUSLY COMMUNICATING SAID PRIMARY FLUID PRESSURE CHAMBER TO SAID CONTROL DEVICE AND SAID SECONDARY FLUID CHAMBER WHEREUPON SAID SECONDARY MOVABLE WALL AND SAID CONTROL DEVICE ARE OPERATED BY PRESSURE DEVELOPED BY SAID PRIMARY MOVABLE WALL WITHIN SAID PRIMARY FLUID PRESSURE CHAMBER; AND MEANS RELEASABLY CONNECTING SAID SECONDARY MOVABLE WALLS AND SAID SERVOMOTOR MEANS, SAID MEANS BEING FORCE TRANSMITTING RODS OPERATIVELY CONNECTED TO SAID SERVOMOTOR MEANS SUCH THAT WHENEVER POWER IS AVAILABLE TO SAID SERVOMOTOR SAID SERVOMOTOR ASSISTS SAID PRIMARY MOVABLE WALL IN OPERATING SAID SECONDARY MOVABLE WALL TO DEVELOP PRESSURE WITHIN SAID SECONDARY CHAMBER WHEREAS SAID SECONDARY MOVABLE WALL IS FREE TO MOVE RELATIVE TO SAID FORCE TRANSMITTING RODS WHENEVER POWER IS NOT AVAILABLE TO SAID SERVOMOTOR MEANS.