Sometimes (but rarely) when I come to a stop, I would feel a kind of shaking or pulsating complemented by a type of groan . Is it the ABS doing this? It happened this morning as I depressed the brakes. I think the groaning (if it can be described as a noise, maybe it's the sensation) came from the front, almost sounded like it came from under the car--I don't know. It freaked me out because I thought perhaps the tranny is the source, but I think it's the ABS. Is it normal for the ABS to do something like that? Thanks.