for a second this story reminded me of my old 02 WRX (was new at the time) that had over reacting biotch ABS where any quick dips or bumps on the road would extend braking distance by about a mile.
i pulled the ABS fuse after that incident. i dont think there's anything wrong with the Z's abs.. must be that stretch of road.
also when it pulses people tend to let off the brake pedal. dont. just keep pressing while the system calculates your previous brownie points and begins decleration.