In message , at 13:23:19 on
Tue, 28 Oct 2014, Recliner remarked:

Traction control brake actuation is diminished above 40 km/h (25 mph).
Above this speed traction control relies primarily on engine torque
reduction.

So a sort of "rev limiter" really, and they've stopped using the brakes
to burn of the excess. That accords with my own 'sniff test' wrt the
engineering aspects involved.

Back in the day I had a somewhat powerful car that could spin the rear
wheels at 60mph on a dry road in 3rd. You could tell it was doing that
from the way the engine surged. Of course, do that going round a corner
and it was a choice of applying opposite lock or ending up in the ditch.

In fact the first time I took the car to be serviced the chap
congratulated me for having made it that far without putting it in a
ditch! Once you got the hang of it, it was a case of being able to steer
both ends, the front with the wheel and the back with your right foot.

--
Roland Perry