On my 77 Bonneville and 80 Honda 750, they would suggest bleeding the brakes every now and then with a shim between the pad and the rotor. The honda even came with a shim in the toolkit. Cannot remember the size.
I was wondering the same thing about the belt to chain conversion, Years ago I had a metric with chain drive and it made a hugejass mess of the rear wheel from spraying chain lube on it. I was glad when the next metric bike I bought had shaft drive. I'm more than glad my Sportster has belt drive, in fact, I'm thrilled that the rear wheel stays so clean.
I plan on doing the conversion cause I want to eventually want to do a rigid with the old school look with the chain and all, I'm gonna try some of the suggestions with the front pads and have the front wheel trued to see if that makes any difference. It is a strange thing cause it went from riding home one night and everything being fine to this loud noise from the front end and I wasn't riding hard, no laying the bike over to hard in turns or anything just gradual cruising at 40 or 50 mph. I at first thought it was the wind cause it was about to storm but when I got to about 20mph with low wind and the clutch in you could still hear it.
I'll continue to update as I search for potential flaws that make this noise come about.
I had a noise... thought it was coming from the front brake... in fact, it was, just damned hard to find.
What mine was... was the !@#$@#$ anti rattle clip had come loose somehow. You'd look at the pads, fine. Braking effort and efficiency, fine. Noise. Just the clip.... mine lost spring temper and was more or less just a bendy piece of metal. New clip had lots of springy to it, and was a 5 minute fix.