Brake Grinding Noise problems of the 2012 Hyundai Accent

I was travelling east bound on memphis avenue at approximately 35 mph approaching tiedeman road in brooklyn, ohio. I attempted to apply the brakes which gave a rubbing and grinding noise and caused my 2012 Hyundai Accent to rear end another vehicle resulting in a total loss to my vehicle. The air bags did not deploy and I was treated for contusions to my ribs, arms, stomach, shoulder and face as well as a sprain to my wrist. My vehicle sustained substantial damage and was a total loss, so why didn't the air bags deploy!!.

I was driving at approximately 65 mhp when I heard a sudden loud pop/noise that appeared to have come from the rear right side of the car. I thought a tire had exploded. I parked the car on the side of the highway, and upon expecting the car , I could not visually observe anything wrong with the tires or any other part of the car. Later on that day , as I was driving the car I began to hear some grinding noise every time I slowed down, turned or when softly applying my brakes. I called the dealership but they could not service my car until 4 days later so I contacted a mechanic that following day and he said that I needed rear brake pads and new rear rotors. The right rotor had been grinded away on the upper part and the left rotor showed signs of overheating. The mechanic ended replacing the rear rotors and rear brake pads. I use the car for commuting from work to home and viceversa (I drive 50% on the freeway/about miles each day) however it was noticed the front rotors and brake pads are still in good condition. Has anybody experienced similar brake/rotor with this car?.

I am a very cautious driver who is very easy on my brakes, to prevent wear. I could not stop in time when a vehicle in front of me suddenly stopped and had to turn, even though I had plenty of space to stop, I had to swerve in front of another vehicle because my brakes are worn down at 17k miles??? something is obviously wrong with the brakes in a 2012 Hyundai Accent. There needs to be a recall. Even if I floor the brake pedal I don't stop and hear grinding noises.