1993 Buick Regal Owner's Manual - Page 143

If there's a problem with the anti-lock brake system, the anti-lock brake system warning light will stay on or flash. See "Anti-lock Brake System Warning Light" in the Index. I Here's how anti-lock works. Let's say the road is wet. You're driving safely. Suddenly an animal jumps out in front of you. You slam on the brakes. Here's what happens with ABS. A computer sensesthat wheels are slowing down. The computer separately works the brakes at each front wheel and atthe rear wheels. 141