Joined: Oct 2011
Posts: 625
Likes: 45
From: Youngstown, OH
Bikes: '63 Schwinn American, '64 DL-1, '65 Schwinn Racer, '73 Super Course, '83 Voyageur SP, '89 Miyata 914, '03 EZ-1, '13 Raleigh i8 Folder
Lots of discussion in this thread and some good tips on fine-tuning cantilever brake setup, but considering those are ~25-30 year old Shimano brake pads, I guarantee you they are about as soft as concrete and replacing them with even cheap replacement pads will solve 95% of your problem.