In message

, at 03:39:08 on Mon, 27 Oct 2014, Recliner
remarked:

ASC supersedes simple traction control, though it's sometimes called
traction control (that was the name used when I first got it, many years
ago, before the more sophisticated ASC superseded it). It reduces the
torque going to a wheel without traction,

It can only do that if the controlling element is in the differential.
Otherwise all the torque is still going to the wheel, but the brakes are
stopping the wheel from rotating too fast, which means those brakes are
absorbing the power, which is thus not (purposely it seems) available at
the road surface.

and hence controls traction. ASC gets ever more sophisticated, and in
some cars now includes torque vectoring as well.

--
Roland Perry