smitten by саша
Join Date: Sep 2008
Location: Eugene, OR
Bikes: Salsa La Cruz with Rohloff; mutt parts
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i hear your pain: after about 3k miles on my BB7s i have pretty reliable squeal at certain times. a couple of solutions work for me (some of which you've already done):
1. make sure the pad-to-rotor clearance is as close as effectively allowable (it looks like you've done this)---a rotor that has to bend further to meet the pads squeals more.
2. non-metallic pad compound (you may be limited here; the organic pads made a difference in lack-of-squeal for me)
3. compressed air for a quick clean to remove gunk build-up; of course you should break them down completely and properly clean them from time to time.
4. new pads, new rotors---pads before rotors, since they're somewhat less expensive (somewhere around 1/3 the price, in my case); sometimes a rotor may have grooves bad enough to make constant squeal, which you can either reface or replace (in my case it's just simpler to replace)
5. learn to live with a little squeal---sometimes it's just more hassle than it's worth it to fix a tiny bit of squeal, unless you require a ninja bike. i just treat it like a warning noise to indicate my braking
(it usually happens for me on steep incline high-speed braking under a 75# towed load... real trains make the same noise).