I had changed my front pads a few months ago and used some ceramic ones but didn't put on a new sensor so I just ordered up pads for all 4 wheels and new sensors. Got everything changed and my brake light is out which is good. But today I was driving it and all of the sudden it started making a very loud sound. I think it's a vibration but I can't feel it so I'm not sure. When I press the brake in just a little while driving, enough for it to go in some but not start braking the car the noise(vibration stops). Any clue as to what it might be? I took the pads off and put them back in thinking I might have just not got them installed correctly but that didn't help.