just throwing this out there to get any opinions /ideas.wife claims she can feel brake flutter/shutter/vibration what ever you wish to call it.happens only on highway with warm brakes slowing from 130km-100km dosnt happen at other speeds.i know a warped rotor can cause this symptom but vehicle only has 39,000km so dont want to change/turn rotor until ready for new brakes than will probly just go with drilled slotted rotors.was wandering what else might cause this symptom?i know these year of cars had a problem with speed sensor front passenger side(recall well known) but didnt think that would cause this symptom.