Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
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Probably an Atom hub brake. Seems like just the rear wheel on that Schwinn tandem weighs around 7 or 8 pounds right?
If it is, the hub itself forms the drum and the plate that holds the shoes floats onto the axle with a locknut that you should be able to see from the left side of the bike. If you make it fit too tightly against the drumm it'll rub and scrape. You can adjust the clearance from the drum with washers on the inside. Once you take that plate off, the mechanism is pretty self-explanatory.
You might be able to substitute a cable binder bolt from an older side pull rim brake or even just use a common bolt and pinch the brake cable up against the brake arm the way that a derailleur does. If you need to replace the brake lever, you might want to look at mountain bike linear pull levers because Atom's take more cable pull than most other brakes.