I have this problem. I'm a lazy dude and usually can't be bothered to grind to often if at all. Which usually works just fine. But lately my brakes have been really bad unless I have a pretty fresh grind. Now I've read about dust. And since it now has gotten dry and dusty outside I'm thinking this might be the reason. So what do you guys do about dust? I have maggies with rb-lever and koxx pads. The koxx pads are getting pretty worn down and old. Can brake pads get old and thus work bad? Mine are about 4-5 months old... I've taken to natural lately and good brakes seem to be much more important when I'm out on the uneven stuff.