The bracket looking thing is an old seat-bolt-mount cable hanger



with the bolt/washer from an old straddle hanger.



NB. converting a cantilever to a direct pull this way would ordinarily increase the mechanical advantage too much for the levers. By using the wide profile CR720 canti arms, the cable makes an acute angle with the arm reducing the MA to the right range again. It also makes it so that the mechanical advantage rises through the stroke, improving power and pad clearance.

The straddle cable goes over a roller mounted at the fork crown. It's a sliding door roller from the hardware store.

The effect is like a mini-V but with even smoother cable routing and more tire/mud clearance. It also eliminates steertube flex from the system, which can cause shuddering on cantilever systems esp. if you are large and have the cable hanger at the top a big long headtube.

The whole setup is similar in spirit to the old Cannondale "force 40" or Suntour "Power hanger" widgets from the early '90s, but those systems suffered from having too high a mechanical advantage (i.e. hardly any pad clearance and mushy feel) and not pulling both sides equally (pads wore unevenly, impossible to keep centered). Using a roller instead of a cam at the fork crown ensures both sides pull equally, and the wide profile arm in this configuration scales back the mechanical advantage.