I have a V6 base but I've experienced this more with TRaction Control off and Stability Control on. Though I have had it happen with everything off, too. Apparently is has everything to do with the ABS. TMS Bus Lot is really slippery so if you brake exceptionally hard and start to slide, the car thinks you are on Ice. Apparently The intervals at which ABS brakes stop the wheel are way too fast for ice conditions so the ABS tried to compensate. I've also experienced it AFTER an AutoX when on the drive home. Kinda odd... But maybe the system is still "worried"
http://www.sccaforums.com/forums/aft/392890
I don't think there is anything we can do about it other than brake sooner :/