I have rebuilt a trike wrecked a Champion kit and now has Harley DNA rear end. The champion set up worked awesome. It is a Yamaha 1700 which i bought triked and wrecked. I couldn't get another replacement Champion kit so I bought the DNA Harley and a shop ADAPTED it. The kit came with dual piston calipers and would never get right. Would either lock up and release after time or not stop it. Since the old kit had single piston calipers i changed it back to single pistons. have bled, changed master and now it will stop but to get good (has never been great since Champion kit) if i pump it a couple times. you can feel it initially engage but to truly stop it needs to be pumped a couple times. Have tried a proportioning valve and didnt do a noticeable thing.