Sounds like warped rotors to me.I have had a few Toys with warped rotors.(pretty common) In my experience I have never felt it in the pedal.If your rotors have been turned in the past due to warpage than I would suspect that they are warped again.Turning warped rotors is a bad idea.Buy new!I have drilled+slotted rotors and OEM pads on my T100 and have been very pleased with the results.