Originally Posted by Zeeper
ABS uses individual sensors on each wheel to regulate the brake pressure for that wheel. But in our cars you cannot separate ABS and VDC.
They have to be compared to each other in order to figure out if the car is moving or not. ie: If the ABS see all wheels are "stopped", it'll assume that the car is at a complete stop; it wouldn't know if the car is still moving. On the other hand, if it sees one wheel is locked while 3 are still moving, it'll know that wheel is locked up, and attempt to "correct" it.