Decided to replace rear rotors and pads to eliminate a rubbing noise that sounded like a pad sitting against a rotor. I used the ProLine brand pads and rotors. After replacing I still have the rubbing noise, but now also have a terrible grinding noise. Everything has been checked for tightness and the pads are oriented correctly in the caliper housing. I can not figure out where this is coming from. The brakes don't make the rubbing or grinding sound when slightly depressed. They rub with when the brakes are not depressed. They make the grinding sound when under heavy braking right before the vehicle slows to a stop. I believe these are two separate issues. The rubbing could be a piston that's not retracting all the way and with new thick brake pads doesn't leave that much room. The grinding sounds like metal-on-metal, but has me completely puzzled.

Any thoughts?