Last night my front brakes were making a grinding sound when I pressed on the pedal it did this two or three times before going away. I had to press all the way to the floor before they would catch, and even then there was hardly any stopping pressure. The car has 12k miles on it the brake pads look fine, and there is no wear on the rotors, it has the regular brakes not brembos.also the roads were dry. Anyone got any ideas???