I have this feeling when braking that the car is coming and going like maybe the discs are warped. Could this be the feeling I am experiencing? If so, is there anyway to keep discs from warping? Also, what about vented discs, are they a good idea or not? I just replace my front pads about 5k ago. If I replace the discs, will I need to purchase new pads again? Any help would be appreciated.