1997 GMC Jimmy Owner's Manual - Page 173

I The anti-lock system can change the brake pressure faster t h a n any driver could. The computer is programmed to make the most o f available tire and road conditions. Here's how anti-lock works. Let's say the road is wet. You're driving safely. Suddenly a n animal jumps out i n front of you. You slam o n the brakes. Here's what happens with ABS. A computer senses that wheels are slowing down. I f one of the wheels is about to stop rolling, the computer will separately work the brakes at each front wheel and at the rear wheels. You can steer around the obstacle while braking hard. As you brake. your colnputer keeps receiving updates on wheel speed and controls braking pressure accordingly. 4-8