I want to put the caliber on the sprocket itself. I don`t want a sprocket & disk. I`m talk`N use the sprocket to drive the bike & slow it with the caliber... on a coaster brake rear wheel. The mountians I ride in are kinda steep, I need ALL the brakes I can get !
Custom m/c builders (Rook) are doin' it. And your chain if properly maintained does not drip and any splatter should go outward when it spins. So unless you sray oil on your chain w/ it mounted you should be ok. Am I the only person who thinks my coaster rear is fine? Granted I want a front brake and I'm goin' w/ Sturmey Drum.
I have seen this done on go-carts. The caliper was a bit beefier than the typical bicycle ones. I thought it was a very elegant and simple solution. I think the only way to do it will require welding your mount to the frame so it probably won't be a modification just anyone can do.