I'm getting a shaking in the steering wheel when I brake. It's more prominent when braking lightly. Here's the story... I put on new rotors, put on winter tires/rims and had no issue at all. After a couple of weeks I swapped the rear wheels with the fronts and now there is vibration when braking. The tires are directional so I made sure the left and right tires are where they should be. Any ideas as to what it could be? I doubt it's the rotors because they were fine before the wheel swap.