Originally Posted by
polygon1
Do they? The Tektro RL720s (for example) are described as compatible with cantis and road calipers, but not V-brakes.
Maybe not, I would have thought generally they are cross compatible (LOL) but I guess maybe they may not. The Pauls do have a different pivot point for linear pull and long pull disc brakes it looks like. The wisdom an old mechanic passed to me a while back is that didn't matter as much but maybe it does.
Really...

Yes actually.
From Park Tool:
The in-line lever pushes on the housing, effectively making it longer, which causes the brake caliper to close on the rim.