same thing happened to me a week after I picked up my (brand-new!) 'Bus. Grabbed the front binders at low speed set up for a left turn out of a driveway and the damn bike practically threw me to the ground. Great big scrape in my generator cover, and I ended up with my left foot pinned between the main fairing bolt and the road - I felt like a turtle on its back. Saved my plastic, though. Good thing one of my buds was with me, or I'd probably still be lying there in someone's driveway...
The trick is the front brakes, they grab like hell at low speeds, and the Bus' higher center of gravity ( compared to a cruiser) will almost always make you overbalance when they do, if the steering isn't straight. Use the back brake if you are going under 10, only the use the front when at low speeds if falling over is better than "running-into" and always be ready to get your left foot down!
--Steve
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