I just found this thread today and my wife's 2013 Edge has started stalling and the brake pedal is hissing now when pushed, I tried looking up the VIN on the link posted above but it doesn't say anything about the booster, only about door latches. I feel certain this is the cause after reading it but we just bought the car from the original owner back in May of this year and I doubt they had it done. Anyone have input as to what I should do? Any help is appreciated.