When I put the Rivco risers on I had to disconnect the front brake hose at the master cylinder and relocate it behind the top yoke/triple tree. I fully expected to have to bleed the brakes but to my surprise, I didn't have to. I've checked them and all is OK. What I think has happened is that after I reconnected the hose to the master cylinder, gravity did the work. I had to stop working on my Rocket for a few days, so I can only assume that any air worked its way up and through the master cylinder. The bike was left with the front end turned left on full-lock and being on the side stand the front master cylinder was now fairly elevated. The front brake is firm and no dramas with the ABS system either; however, I wouldn't recommend this and if you don't know what you are doing (especially regarding brake maintenance-bleeding etc.) get it done by a professional. I think I was lucky.