Identify Disc Brakes on Dart?

Thanks I’ll add that to the history folder. I knew there was something with them, that’s why I stated it.
While that's a great article for identifying brake components, Ehrenberg was completely wrong about the geometry issues with the B/R and F/M/J spindles. That was something he just speculated, and he never bothered to actually check. Because if he'd bothered to check he wouldn't have said any of it.