The only time I ever had it engage in my firebird was when I drove it in the snow. ABS works well in rain, the rear wheels in my truck use it alot in heavy rain if I'm playing. Whenever I had it kick in in the snow it seemed like it took much longer to stop than if I had gone easy on the brakes and kept them for the point of locking up. Since my car only sees dry pavement and occasional wet pavement, it never kicks in. 315 wide tres help, too.
1995 Firebird Formula - The Black (money) Hole
2003 Silverado - Gotta have one stocker
1966 C-10 - Waiting for a driveline