Should i hear a rubbing (light grinding) when i brake (not hard, but when just normal or crawling in traffic) ? have taken it to vw and they said "they r fine with plenty life left in the pads" but they cleaned them and should be ok now? but when i left the noise was still there, when i called them they said "the noise might be the harder pads on this car with it having bigger brake discs.....??.