Nissan Primera ABS starts too early
 

I have a problem with my Nissan Primera -01. The ABS-system goes in even if I break smooth and not lock the wheels. Do you have any ideas why the ABS-systems starts, before needed? The ABS lamp does NOT indicate something.

So, to make it even more clear: Every time I stop for red light and break smooth, the ABS system starts to work and I feel in the pedal that it's pulsating.