I WAS DRIVING ON SR 441 WHEN A VEHICLE IN FRONT OF ME STRUCK THE MEDIAN. I HIT THE BRAKE PEDAL AND THE BRAKES DID NOT RESPOND. THE VEHICLE WAS TAKEN TO AL PACKER FORD (TOWED). THE DEALER REPLACED THE MASTER CYLINDER. ON OR ABOUT APRIL 15, MY SON AS OPERATING THE SAME VEHICLE WHEN HE NEEDED TO STOP QUICKLY. MY SON HIT THE BRAKES AND THEY DID NOT RESPOND. NO COLLISION OCCURRED AT THIS TIME. *TR