Wow, memory does exist a little. When you said after turning and then going straight it makes the noise, that is exactly what happened to me and it turned out to be be pieces of rock or dirt or broken up emergency brake shoes that had caught between the inner shield and the rotor. Yes, they were just laying there making noise. Found by removing the rear wheels and turning the rotors and listening and watching to see if there are particles in there. So many possibilities. Good luck, Kurt