Power Assist Brake Vacuum problems of the 2005 Ford Escape

In 2006 I experienced the failure of my car to operate one morning. I initially thought that I had made the error since I have a manual vehicle I occasionally take my foot off the pedal; I had no idea why the car had stopped running right after I started it as I began to pull out of the parking space. The car stopped a couple of times which concerned me so I contacted the dealer in new jersey where I was located at the time for him to look at the car for this problem. He assured me that the parts would work and all was right again as I left the service department, new 5l8z-2c053-ba and yl8z-19048-aa parts installed. One year later, November 3, 2007 the same problem began to happen again. I immediately took the vehicle to the dealer and he informed me that the cable and the foot pedal vacuum were no longer operating (5l8z-2c053-ba and yl8z-19048-aa) as was the case the previous year and that he had to wait for a new part in order to replace these defective parts. I asked why this had happened again, and what I was told horrified me. The manufacturer most likely had not resolved the problem of the past and that the problem was in the parts. I asked why there was not a more life safety solution to this very dangerous problem and I was told that since this did not happen often it was not deemed a real issue. The rationale is appalling. How am I expected to be safe with this vehicle when the condition is not resolved it is just prolonged, with failure looming over me? how do I drive my child and the other members of my family and friends in a vehicle that can stop operating at any given moment?? my complaint is in regard to life safety and value of reciprocity. Since there is no death as of yet, I must wait for the failure? this is emotionally stressful.