The Cruze's ABS system works very well, although it feels a bit different than others. The first thing you have going for you is brake force distribution working out where to send braking force from front to back. Secondly, you have panic brake assist which, when the computer detects a panic stop, it automatically increases the braking force to the point of lockup at which point it realizes the boundaries. Third, you have the ABS computer constantly reading wheel speed sensors and determining what the max braking force can be without completely locking the wheel up. This can be a different pressure at each wheel to ensure maximum grip and stopping power while still having steering control. The Cruze seems to almost be able to threshold brake each wheel independently. The screeching you hear is not a complete lock up, but rather the tire on the very edge of grip, going slower than the car is moving but still not locking completely. All of this culminates into what you all have said, it stops VERY quickly, all things considered. GM has some very advanced safety tech.
TL;DR: basically when you slam on brakes, the ABS computer takes over and sorts everything out for you.
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