Another alternative (depending on your local) is snowmobile brakes. There are tons of scrap/parts ones out there & even E Bay. They're stout floating disc brakes and if ya buy a entire parts snowmobile like I did,,you get everything,mount,disc,caliper,m.cylinder ect. I bought a old Artic Cat for $125 ,got the 340 running and stripped all I could use off it,,,then scrapped the rest for $46 ! Take a look on E Bay,you'll find all these big name brake manufacturers names ! I've seen complete set ups for $45