I have a 2004 Titan 107,000 miles on it. Recently it started making a thunk kind of noise when I hit the brakes. It only does it onces the brakes have warmed up and when I apply brakes going forward. The sound seems to be coming from the front left of the truck. I took a look at the rotor and pads and they're both wearing beautifuly. I double checked all the mounting hardware and its all tight. Any help would be great, thanks.