On really heavy use they overheated to the extent that they were smoking and faded. At first I assumed the rear calipers were seized on, but they turned out to be free when I jacked the car up.
The vents must count for a lot but don't know if you'd feel the difference unless you are going really heavy on them.
Unfortunately the brakes are great on the S12 but just don't stand up to continued heavy abuse.
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