I have not tried the ABS but will. I am not braking at a level that would being me even near abs activation when this happens. At least I don't think so. That kind of jitter jutters anyways when it activates though right, not a pulse? Ill try it.
Pard, ill give stuff some cleaning and see what I can find. One goofy thing I have done in the past with other equipment is XRF it, just a slow CW beam sweep and watch the numbers, if you find a big spike, you know you hit a spot with some crap on it, in it, heavier oxidation etc etc. Geeky, just something else to take a look at 'things' and how they are.
Cleaning though, again, it comes down to, a rough spot / crap on pads-rotors should hit EVERY rotation, which as pointed out by earlier math, should be several a second, not one a second or so.
I ride a Ribelle, and this is noticeable at slower speeds, more specifically when slowing down at a light or intersection in a situation where you KNOW regen is absolutely not going to stop you, so you are not emergency braking but applying a bit of force and letting it up a bit of course, as you slow and get to your final stopping spot. I'll say 25 to 30 mph and below?
I'll have to keep a keener eye / feel and try to get more accurate info on when its happening so I can report back.
Thanks everyone.
Aaron