Originally Posted by
SJX426
Pederson Self-Engagement System - The calipers are on a spring loaded helical track. When the brake is applied, the resistance pulls the caliper in towards the rim, increasing the brake force.
P1010340 on Flickr
Suntour removed the front brake from the market due to lock ups potential and litigation risk.
How about 3 in one photo? I DO have the Pedersen SE Brake front version with Odessey Straddle Rods instead of cable on an SR Litage bonded aluminum fork. This is on a 1985 Cannondale SM 600 with 26" front wheel and 24" rear wheel.

Also have Bullseye Cranks. Maybe not weird, but kind of ahead of their time with 2-piece construction.