Brake Popping Noise Problems of Toyota Corolla

I purchased a 2015 Toyota Corolla from charles maund Toyota on June 15, 2015 and around a month after I bought it, I have been having problems with the breaks ever since. My service technician and other service men said a lot of people had been bringing these cars (2015 Toyota Corolla) back for the same noise and other brake issues as I described. There is a cracking noise when I put my foot on the brakes sometimes. Dealer service men said this is something that I will always hear because of the materials Toyota makes their brakes and pads out of, once it reaches a certain temperature, I will hear the noise. Sometimes brake pedal goes down to the floor by its self after I have stopped. Service men said they felt the brake pedal go down and said they fixed it. But on October 30, 2015 it started going down by its self again. Both front wheels now making loud popping or knocking noise when I put my foot on the brake sometimes and wheels do not stop, they keep turning. Service men said they could not do anything because it never happened when they drove the car. October 21, I had another scary event in the parking lot at my job as I was leaving work for the day in my 2015 Toyota Corolla. As I went around the first curve in the garage, the popping or knocking noise from the right wheel started again when I put my foot on the brake, as I went around the 2nd curve and braked, the popping noise came from both wheels and they did not stop rolling when I put my foot all the way down on the brake. The wheels kept turning, it felt like when you think you have tighten a bolt all the way, but then it slips a little further. I have the most problems when going down a slope.

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