One of our bikes is an electric bike. It's an older iZip HG 1000, and although we got it through the American "manufacturer" (Currie Technologies), like most of the low-end ebikes it's made in China of heavy steel and uses cheap, cheap, cheap components.
The rear brake is called a belt brake or band brake. When I was researching this a bit, I came across a discussion that said this type of brake is something like 20 cents cheaper than V-Brakes to manufacture in bulk, which is why it shows up on this type of bike.
Here's a couple pics: just the brake and then one mounted on a bike (not our bike):
Actually, now that I look closely at the pictures, I can see part of why it's cheap - no special frame fittings needed. The donut-shaped "drum" mounts to the hub, the other piece just fits over that drum and is clamped to the seat stay.
My problem is that the thing squeals like a banshee. There's no pad adjustment as there would be for cantilevers, the only adjustment is how tight the belt starts. If I loosen it enough to stop the squealing, there's not enough pull to actually stop the bike.
Is there any adjustment I could do to get rid of the squealing?