Hi, Iím building a winter bike out of an old lugged Japanese MTB frame that is made with Tange MTB tubing. The problem I am having is with the rear brake. It uses a U-brake which mounts on the bottom of the chain stays and from what I learned it this was used for about one year 1988, and was discontinued due to a few problems. Since I do not have the original U-brake what can I use as a replacement? Any help will be appreciated.