Thanks for all the info, guys. I wash the bike fairly frequently (did it this past weekend in fact), so I don't really think there ought to be too
much stuff in there. I do, however, live in ABQ, and it can get dusty around here. Guess I'll have to give em a look and see if they're less than
0.8 mm (0.03 in) thick
I'll use my super vision, since I don't have a caliper.
There are no brake indicators to let you know your brakes are getting low. The fronts can be checked visually while in place. The back requires loosening a bolt on the back caliper and checking the pads. It's easy to do. I need to check mine this weekend. I know they're about due and already have replacements for them.
Cleaning your bike regularly (with a hose) helps keep the squeak to a minimum.
Worse case if you can't get rid of the squeak, just get louder pipes.
I've got the Motron Turndowns...do they make em louder than that?