I rotated tires on my truck the other day and noticed that the wheels spun freely, but make a slight grinding noise from the brake pads making contact with the rotors. I just replaced pads and rotors a few months ago along with all of the brake hardware and re-lubricated all the hardware and guide pins. Both driver and passenger side do this, didn't check the rears. Is this normal for brakes or do I need to take stuff apart and re-lube things? Rotors are definitely hot after driving for a little bit. Doesn't seem normal, but I am not an expert.