[dallas.tx.usa]

I had howling sound as a I rolled to a stop in my 2000 Odyssey too. Particularly when hot. The shoes were fine so I did the following:
- With drums off sprayed/flushed down brakes with brake cleaner (1/2 can on each side), and sprayed the drums as well.
- At the points where shoes rub on the back plate I applied a very small amount of wheel bearing greese with a que tip.

The brakes are now silent. I can't be sure which one did the trick...probably spraying the drums. Good luck...