HAVE A 62 DRUM BRAKE CAR. BRAKES WERE NOT RELEASING.RAISED THE CAR HIT THE BRAKES. THE REARS WHEELS SPUN FREE AND THE FRONTS LOCKED. REPLACED THE CYLINDERS,SAME PROBLEM. PULLED THE MASTER AND THE PISTON INSIDE MOVES FREELY AND RETURNS TO STARTING POSITION, SPRING GOOD.WITH THE MASTER REMOVED I PRESSED THE BRAKE TO SEE IF THE PRESSURE ROD WOULD EXTEND OUT SO I COULD PUSH IT BACK IN. IT'S STUCK OUT AND WON'T DEPRESS IN.WHEN I PUT A NEW MASTER ON AND HOOK UP THE VACUME. WILL THE PEDDLE COME BACK UP.