Brake Antilock Control Unit/module problems of the 2003 Subaru Impreza

Had to brake hard on semi-bumpy pavement and abs activated and lost all stopping power. Abs is way too sensitive and over-reative. I ended up slightly crashing into vehicle in frot of me. This abs problem has occurred numerous times and I was well aware of it, however I was still unable to compensate and make a complete stop.

Abs in my Subaru Impreza wrx engaged unexpectedly as I tried to stop on a bumpy (small light debris) road. As distance lessened between myself and the car in front of me, brakes did almost nothing to slow the approaching speed. To avoid collision, I veered off the road causing damage to the front bumber skin of my car. All damage was cosmetic, and involved no other vehicles. I have experienced said abs problem before, but never resulting in damage or overly dangerous situation. I have never experienced this before in any other abs equipped car since I began driving. In my opinion, there seems to be problem with the way the abs computer decides when to acctivate and under what circumstances it needs to function. I could forsee this being a larger problem and leading to a more severe accident.