Get it scanned to tell you what is the problem. I had the same problem, every time I hit the brakes, the ABS came on. For me it was the ring that is on one of the front drive shafts that is what the wheel sensor reads, it was cracked, so I had the axle replaced ( not that expensive I believe) and it worked great since then. The ABS on my Malibu stopped working cause I need a new wheel speed sensor, but it is part of the front hub so it is not cheap ( 300-400$ CAD) and I really miss having abs. ABS has saved me a few times in the snow and rain.
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