Oh, and good luck fitting this system to any mower for under $200. I did a quick search yesterday for just the master cylinder and the cheapest I could find was almost $140 plus shipping. Then you'll need SS brake lines, machine work, a way to mount the calipers (the calipers are not mounted in these photos, they're just sitting on the rotors), the calipers, rotors, 360° fluid universal joints, some sort of brake warning system and a fluid distribution block.
Pictures of the concept is one thing. An actual, safe operating system is another. The reason I waited so long to show my Ferris SD brake system was simple. I wanted to wait until we had a 100% functional system that worked as intended.