There have been a few. check out this link to a previous thread here:
http://www.lexusf.com/forums/showthread.php?t=842&highlight=squeak+brakes
There have been a few. check out this link to a previous thread here:My ISF has just over 6000 mils on the clock. I have noticed that when slowing down to a stop light my brake(s) squeak for a bit.......anybody else have this issue??