ever since i dyno'ed car and abs light came on (wheel speed sensor thing common when dyno'ing, i'm told) i occasionally notice a pulsation in the pedal when lightly to moderately braking at low speeds. ??? idk...?:dw:
It may be just a coincidence that you happened to notice after the dyno but a vibration or semi pulse on the brake pedal at low speeds usually means that your rotors have warped and are not hitting completely flushed. After the dyno you were probably paying a lot more attention to your car.
If you have stock ones now would be the time to upgrade, or you can go have them turned at a pepboys and you will back to good...