2011 Road King 7500 miles....I am experiencing a vibration that is felt throughout the complete bike, from the handlebars to the seat. I experience this problem only when I first start my ride, while the bike has not gone more then a few hundred feet. The vibration increases when riding two-up. It only occures when the rear brake in used (no front brake). It is not the Antilock braking system. I know what that is and it is not the same. (No vibration of the foot brake, which occures durnig the engagement of the antilock system). This problem disappears when I make a few rear brake stops. I brought the bike into my local HD dealer and he checked the rear brake rotor for wrap, brake liner for wear, rear wheel bearings, drive belt and shocks. No problems found. Stated it was not a safety problem. Not his bike, so I do not know if he really cares. If you know of anyone who has experenced the same problem, please inform me. I am trying to find the cause of the problem before I contact The Motor Company. I have had a previous problem with another Harley I owned. And the manufacture does not really do a good job taking care of problems without you knowing what is causing it.