NHTSA Complaint #10234874 — 2003 LINCOLN NAVIGATOR

MY WIFE DROVE OUR 2003 LINCOLN NAVIGATOR TO WORK AND ALL WAS FINE, WHEN SHE WENT OUT TO GO TO LUNCH SHE STARTED THE VEHICLE AND PRESSED THE BRAKE PEDAL AND IT WENT ALMOST ALL THE WAY TO THE FLOOR. THE BRAKE PEDAL WAS NORMALLY MUSHY, BUT THIS IS UNSAFE AND SHE ASKED ME TO TAKE IT FOR THE REST OF THE DAY. I CHECKED IT OUT AND THE PEDAL, ALTHOUGH IT GOES ALMOST TO THE FLOOR NOW, STILL APPLIES BRAKES, JUST AT A MUCH GREATER DISTANCE THAN WHAT HAS BEEN NORMAL. THIS CONDITION IS EXTREMELY UNSAFE, IF THIS HAD OCCURRED DURING DRIVING AN ACCIDENT WOULD MOST SURELY HAVE OCCURRED, POSSIBLY SERIOUS. I HAVE A FRIEND AT WORK WHO SAID HER HUSBAND WAS HAVING THE EXACT SAME ISSUE WITH THEIR 2005 LINCOLN NAVIGATOR. THE DEALERSHIP REPLACED THE MASTER CYLINDER AND IT DIDN'T FIX IT, AFTER MUCH COMPLAINING THE DEALERSHIP REPLACED ALL THE COMPONENTS OF THE BRAKE SYSTEM BECAUSE THEY DIDN'T KNOW WHAT THE PROBLEM WAS, THIS HAS SEEMED TO FIX IT FOR THE LAST 3 MONTHS. I READ ON THE FOLLOWING SITE SIMILAR COMPLAINTS, BUT BOTH OURS AND MY FRIENDS OCCURS AT ALL SPEEDS NOT JUST BELOW 30 MPH BUT MUCH HIGHER, AS SOME OF THE FORUM HAVE REPORTED. PLEASE READ THE FOLLOWING THREAD. HTTP://TOWNHALL-TALK.EDMUNDS.COM/DIRECT/VIEW/.F1666E3/0 IF IT IS AS SOME OF THE PEOPLE HAVE REPORTED ON THIS FORUM THAT THE PROBLEM IS THE ABS SPEED SENSORS, I AS AN ENGINEER AND CAR ENTHUSIAST, CAN'T BELIEVE SOMEONE WOULD DESIGN A VEHICULAR BREAKING SYSTEM THAT IF THE ABS SENSOR FAILED, THE DEFAULT WOULD BE TO PROVIDE ALMOST NO BREAKING ACTION AT ALL. THIS IS EXTREMELY DANGEROUS AND SHOULD BE INVESTIGATED. I AM TRYING TO DETERMINE HOW TO REPAIR THIS PROBLEM CURRENTLY, SO I BELIEVE I WILL LOOK INTO REPLACING THE SPEED SENSORS AS A PLACE TO START. THEIR ARE NO VEHICLE CODES PRESENT IN THE COMPUTER. *TR