Right, if you think it's the ABS, then you haven't ever engaged the ABS system.

I would recommend testing it your ABS on an empty road, to that it doesn't scare the crap out of you when you have an emergency.

Just drive 45 mph or so and slam the brakes to the floor. Sounds like dwarves hitting your brakes with hammers, and the pedal really sends a powerful pulse. Far more violent like this judder we are discussing.

Try it!