Yeah I run a WMS kit and I've reported to Keri a few times about a squeeking issue with them. I was told it might be because I haven't got grooves discs (I went for normal discs) but to be honest get some good grease, one with a high temp rating and they should be spot on. Can get some online it's just grease made for performance applications. My WMS kit is a treat, one of the best things I've done to the car, so much more confidence under breaking and I would happily attack a track with them.