After seeing Ryan Kerr's front brake setup this summer I decided to try and come up with some for my FXT on the cheap. After some calculating and checking clearances this is what I came up with. Started out by having some custom rotors laser cut for me. 6" diameter, 1/8 thick and with a 2 1/2" bolt circle so it will match up to the front hub. Found some 6061 aluminum tubing that will go in the lathe to make the correct size.
Then found some calipers on ebay that will work. They are single piston, lt. and rt. with hoses and a hand master (that I did not use). Here is a link for them.
http://www.ebay.com/itm/ATV-Front-Hydraulic-Brake-110cc-250cc-/160655998621?pt=Motors_ATV_Parts_Accessories&vxp=mtr&hash=item2567d7fe9d
After machining the spacers (sorry, forgot to take pictures) I used the front hub as a pattern to drill and tap the bolt circle for the hub and rotor. Then countersunk the extra holes in the hub to attach it to the spacer.
After test fitting everything I made a mount for the caliper and welded it to the spindles. Hooked everything up and bled the brakes. Running them into the same master as the rear brake with an adjustable proportioning valve.
Ended up with around $130 into them. Should be plenty of brake for this machine. I think I will still put them on the mill sometime and take some more material off of the spacers. They weigh around 2.5 lbs. with the hub and rotor.