Cal,
Thanks for the insight. I've always disliked U-Brakes and rollercams because I've been a shop mechanic and had to repair or replace them due to people neglecting their bicycles. That area is certainly neglected, with a combination of mud, grease, lube, road salt, garbage, and HAIR from whatever carpeted apartment the offending bike has been kept in. One thing I've read about recently is that the rollercam design can be powerful enough to flex the stays, so I'm going to be either designing or finding a brace to get the most out of the brake. I'm going to do a full overhaul, which will include replacement of cables and housing, chain, and the bike is getting new ss freewheel and chainring. I do need to find a new set of cantilevers around here somewhere, since the old DiaCompes up front are corroded and are known for not stopping as well as they did 35 years ago. I have a couple sets of brakes around here, one of them is a Shimano Deerhead XT which stop very well, but this is the first gen which didn't have a centering spring tension adjustment, which is anyone's only complaint about them. Otherwise, they are outstanding cantis. The brake levers are getting replaced, as are the grips. I have a set of XC Pro levers which I'll stick on there.
This bike is bone stock, as-delivered and like many mtbs of the early era, it is a mix and match of Suntour, Shimano, Tange, and DiaCompe components. I need to get into the headset to see if it is at all indexed also. Mucho busy in my basement shop these days; usually I don't have two projects fighting for the stand. It's all coming together though.
Phil Forrest