i had a HL rear disc brake conversion,they discontinued that kit and you can't buy parts, and my master cylinder seal leaked so bad that brake fluid poured out. so i bought a 450r master cylinder, welded a plate to my frame and a notch on the bottom of my foot brake. works awesome, came up with the idea after i had no other options, and looked over at my 450r and thought i will just redesign it like a sport quad.