Occasionally, when I'm using the rear brake only, and harder than usual, I'll get a kind of herky-jerky action happening. Don't know how else to describe it. It's very brief. When it's happened, I've backed off the brake, and probably engaged the front brake some instead. It hasn't happened often enough for me to have a patterned response.

This is the only bike I've ridden with ABS. So is this just what the ABS feels like when it engages? When I've engaged ABS in cars, the pulsation is much more rapid and regular. This feels more uneven - but maybe that's the nature of ABS on a two-wheeled vehicle, or the relatively older ABS this bike has. Or is there some brake condition that can cause this?