Yeah Hydraulic.
www.btsbrakes.com or
www.qrckarts.com are sites to check out. I am their only lawn mower dealer.
Now you need prices on front or rear or whole kits let me know.
Call 701-400-4084 9 am to 2 pm week days ONLY.
You can e mail gteam@qwest.net too.
Front brakes are held on by two set screws and you need to put a keyway in your front spindles. That's what keeps them in place. They take up as much room on a Azusa spindle as the nylon spacer and hub would. Remove the Nylon spacer and cut a key way or do like I do and mount the brakes and run your lines. I use fittings and Earl's Stainless Steel Braided lines. The hub has 5/16 studs unlike the usual kart stuff with 1/4 studs.
While most brakes are made for karts that reach speeds of 60 plus MPH know this one thing about BTS brakes. The Karts you see that they have run a 50 HP Honda Motor and a 100 HP Honda motor on them 12 Burris/QRC tires. Their Brakes have to work GOOD!!!
Hope that helps
Don
PS Bead Locks are the way to go too. I am getting the guys at BTS to do rims for us mower guys. Sure spendy but no flats and no turning tubes from running low pressures.