so about a week ago, i was on a two lane road approaching an S curve when i had to lock up the brakes because some dumb woman on her phone decided to cut the inside of the curve and come at me head on. anyway, after that i noticed a slight vibration in the brakes, which was more noticible, but not that bad at highway speeds when you slowly apply the brakes. anyway, i swapped out my 20's for my 17's and when i took it on the parkway and slowly applied the brakes, the whole truck started to bounce really bad. my rotors are totally shot, but how is it possible that it is less noticible on 20's then 17's. on 20's i could live with it for a 3-4 months, but on 17's i need new brakes asap. what gives?