Originally Posted by JARblue

Gotcha. You just said "wheel" in your previous post, so I didn't realize you were referring to the steering wheel.

I think you likely have uneven pad deposit, but I'm not going to say your rotors aren't warped. However, it takes enough heat and force to warp rotors that I'm not convinced it could be done in the Z on a single braking pass. Unless, of course, your brakes were already nice and hot.