A few months ago I bought a new rotor, brake pad and hardware kit for my daughters 2008 Honda Element. The pads are ceramic. Everything was new and was cleaned and greased even though they were new. Greased: backs of pads, clips and pins. Her car is driven mostly around town on asphalt. It just started squealing on the passenger rear tire only. I just finished pulling it all apart and rebuilding it. Sanded off all rotor rust and sanded the pad faces as well. It is still squealing. Not sure how to fix this?