Kool-Stops.
Don't.
Leastways, not the yellow ones. I've had them on the front of my Orbit for a while. They were OK (if a bit screechy) for commuting, though I remember I had to readjust them a couple of times.
However, carrying a full touring load down a not terribly convincing midlands hill this weekend, I found that the commands I was giving at the levers were being turned into gentle suggestions at the business end
I'll be refitting Aztecs as soon as I get to the bottom of the current list of more urgent fettling...