[Reaper Z28]

i drive a 2002 camaro z28. when im braking on the highway my wheel rattles and causes the car to shake. I have wider rims and the pavement is pretty rough with ditches so is it just pulling because it doesnt really do it on smooth roads. or is there another problem perhaps you have experienced this or would kno it just started happening i was just wondering if u guys could lend any help it would be greatly appreciated. thank you just let me kno if you know what it is and how i could fix it.