Has anyone has this problem. Sometimes when I stop something in the upper front of the car will pop. It sounds like its coming from the rotor but I am not quite sure.

I also notice that when I backup there is a grinding noise coming from the front left of the car, about where the rotor is. I am not sure what the problem may be and I have yet to look into it but I will tomorrow. Just wanted to get an idea of what it might be before I take it to my mechanic.

Thanks