WHEN WE RETURNED FROM VACATION WE NOTICED THE BRAKE PETAL WAS SINKING TO THE FLOOR. THE CAR WOULD TAKE A BIT TO COME TO A STOP. AT ONE POINT I WAS AT A COMPLETE STOP AT A LIGHT. THE PETAL SANK AND THE CAR ROLLED FORWARD AND INTO THE BUMPER OF THE CAR IN FRONT OF ME (NO INJURIES). WE CHANGED THE BRAKE FLUID AND BLED THEM MANY TIMES. WE RESEARCHED ON WHAT MIGHT BE WRONG. ULTIMATELY I FOUND THAT FORD WOULD REPLACE THE BRAKE BOOSTER DUE TO SOME SORT OF RECALL. THEY REPLACED IT AND SAID THAT THE CAR STILL HAD THE SAME PROBLEM. THEY SAID TO REPLACE THE MASTER CYLINDER, WHICH THEY QUOTED $890 FOR. THEY ALSO CHARGED ME $190 TO DO FURTHER INSPECTION. WE TOOK THE CAR HOME AND ORDERED A MASTER CYLINDER FOR ABOUT $80. WE PUT IN THE MASTER CYLINDER OURSELVES. WE BENCH BLED THE CYLINDER AND ONCE IT WAS INSTALLED WE BLED THE BRAKES ON 5 SEPARATE OCCASIONS, ABOUT 10 MINS ON EACH WHEEL. THE PEDAL WAS STILL SINKING. WE HAD A MECHANIC COME OUT TO CHECK OUR WORK. HE SAID THAT EVERYTHING WE DID WAS FINE AND HE BLED THE BRAKES MULTIPLE TIMES. STILL SINKING PEDAL. HE CONCLUDED THAT WE MAY HAVE PURCHASED A FAULTY CYLINDER. I TOOK IT TO 2 OTHER MECHANICS, FIRESTONE AND BIG O TIRES, THEY BOTH SAID IT WOULD HAVE TO BE THE MASTER CYLINDER. SO...I ORDERED ANOTHER CYLINDER. WE HAD A MECHANIC COME OUT TO INSTALL. STILL...SINKING PEDAL. HE SAID THAT IT MIGHT BE THE ABS SYSTEM, WHICH I SUSPECTED. HE ALSO SAID THAT IT MAY BE THAT FORD WOULD NEED TO USE SOME SPECIAL TOOL THAT ONLY THEY HAVE TO RESET SOMETHI