I recently came across such a bike. I believe it was a Jamis or a Hudson. The bike only had a right hand brake lever which engaged both front and rear brake sets. The rear brake has a floating brake pad that slides forward when it contacts the rim. The floating rear brake pad is attached to a brake cable leading to the front brake set which is actuated when it contacts the rim. As the floating brake pad contacts the rim it slides forward which pulls the cable which engages the front brake pad. The front brake set is normal. We asked the bikes owner about the brakes (which were weak at best) and he asked us to convert to a conventional system with separate brake levers. Some people need a brake system to operate with only one lever but I think the Double Barrel brake lever offered by Problem Solvers is a better option...
