2004 Ford Ranger metal scraping noise

I recently changed my brake pads. I have changed brake pads several times and have a pretty good idea of what I am doing. I do not make any adjustments to the calipers, though. This is the first time I've used ceramic pads. Now I have a constant scraping noise coming from the wheel area. After a couple of weeks of the noise (hoping ti would go away on its own) I removed the pads and cleaned everything again before re-installing them. I was able to turn the wheel much more easily after re-installing them, but now the sound is even worse. The noise goes away when I have full pressure on the brakes. Any ideas or suggestions?