I have a 2014 Mustang GT that has Wilwood's all the way around. They started squealing when coming too a stop so it was recommended by a local shop to replace the rear pads as they were worn. I also just went ahead and had them do the front pads as well. They replaced them with Wilwood's BP10 which is what Wilwood recommended. Anyways, I have the car back now and it's making a groan/moan sound after you release the brakes after they have warmed up. I can't tell if it's coming from the front or back as my loud exhaust is making it difficult to determine. It did not do this with the old pads. It does not do it everytime you release the back, I would say about 50% of the time. The shop said to "break" the pads in for a while and see if it goes away. I've always been told any break noise is bad and it should be check out. The best way I can describe this moan is it sounds like if you are pushing a heavy piece of furniture against a hard floor slowly and it makes a moan/groan sound from the friction. Or if you are driving down the highway and drive over those noise strips they have on the side of the road that makes your tires make that moan sound. I'm not a mechanic so I'm going to have to take this to someone, I guess my concern is if this is normal after a pad change or if something is truely wrong?