TRUCK WAS PARKED SEVERAL HOURS IN SON-IN-LAWS DRIVEWAY. WIFE GOT IN TRUCK, AFTER CRANKING AND PLACING IN REVERSE, NO BRAKES! BACKED INTO SON-IN LAWS VEHICLE DAMAGING IT AND DAMAGING F 150. F 150 STILL UNDER WARRANTY, TAKEN TO MULLINAX FORD MOBILE AL. FOUND MASTERCYLINDER DEFECT , FAILED GASKET CAUSED BRAKE BOOSTER TO FAIL. MASTER CYLINDER REPLACED BY MULLINAX FORD, MOBILE AL. *TR