My rear brakes are making a scrape-scrape-scrape sound when I engage them.
Today while coasting down a hill I used the parking brake to verify that
the sound is the rear drums.

I replaced the shoes and drums about 2 1/2 years ago and have put about
20,000 miles on it.  At the time I had a hard time getting a Brembo drum
that wouldn't pulse when braking and finally had to settle for some
pulsation.  I though it would wear in but now it seems to be worse.

I was looking over Ken Wilford's newsletter on rear brake inspection and he
says that the any wear will be at the top of the shoes.  I pulled the
driver's side drum and the top 4/5 of the front shoe is shiny while the
bottom 1/5 is dull.  Does this indicate what the problem is?