2006 Ford Explorer brakes problems

Tl*the contact owns a 2006 ford explorer. In march of 2006, the vehicle made a grinding noise. The vehicle was taken in for service at least 8 or more times between march of 2006 and october of 2006. In october of 2006, the brakes failed and the contact rear ended another vehicle at 25 MPH. She woke up in the emergency room due to injuries she sustained. A police report was filed. The contact has documentation that she will mail in pertaining to the failures. The failure mileage was unknown.

I bought my 06 explorer with 12k miles. Soon after purchase, I noticed the brake pedal felt soft and seemed to require a longer stopping distance than my old explorer. The dealer acknowledged a problem and replaced the master cylinder. The brake pedal then felt slightly better, but only for a short time. Since that time, there has been multiple times when I was attempting to brake for a turn but the vehicle did not slow down enough to turn, despite having the brake pedal almost to the floor.