Hmm well I also have constant problems with my hayes 9s but I'm not sure if the noise you are talking about is the same as mine...My rear brake makes a VERY loud noise kinda like a....moaning whale, or someone else said a warbeling turkey. I havent fixed the problem all together yet but when the noise starts happening I readjust my calliper, but it only works for about 20 hard stops and then the noise starts up again. So try readjusting the calliper after you check your pads and see if the noise is still there.