I picked up a set of late 70's Mafac "Racer" center pull brakes for only $2.50
Haven't mounted them but they look like they will work if I swap out brake pads. I'd prefer to keep the stock brakes this Trek 728 came with. I'll try to keep this bike stock as long as the parts are functional.
Does anyone know how many of these first year complete 728's Trek produced?