We drift down over those hills on the arrival into Orange County airport as well as Long Beach airport coming in from the east. I always look down at those dirt roads thinking they look like fun. After dark there are frequently slow moving headlights on the roads.
Anyhow, the rear ABS on the V650 reportedly can be temporarily disabled by spinning the rear tire while not moving. Hold the front brake, then spin the rear wheel on a loose surface. Iirc, the front ABS is still operable but I am not 100% sure on that. Perhaps the same procedure would work on the V300. The ABS comes back on the next time the ignition is turned off then on.