On my 1008 (k30) when I hit the brakes at speeds 25+ when I first hit the brakes it will make the whole truck shake pretty bad. It only does it 50% of the time. And if when it starts if i let off then press the brakes again it goes away, or if I hit them harder it will go away. Its just the truck that shakes, not my steering wheel, my steering is real tight. So this is just my rotors right? Or could it be my wheels?