There is a clunk/thud noise coming from the front end right before I come to a complete stop. It only happens after I have been driving the car for awhile. I do have upgraded rotors and calipers on the front end. 13" rotors and calipers. I checked the calipers and they're not loose. I lifted the front end up and checked the for any play and there was none. I can feel the Clunk/thud in the brake pedal when it happens plus the pedal feels like it has a little push back in it when I push it down as far as I can to the floor. Any Ideas?