I have an '06 G35 coupe. I recently replaced the front pads with EBC ceramics, and after several weeks, it seems as if the front-end noise is getting louder. There also is a subtle vibration that wasn't there before. I haven't noticed a changed in gas mileage, and the brake fluid levels are unchanged. Could the brakes be dragging? If so, what might be the cause and the fix? The car has 30K miles on it. Could it be the boot seals on the brake cylinders? If so, what's the fix?