It's not the pavement itself but rather the friction co-efficient, obviously (or not) older pavement has a much smaller contact patch with the tire due to more of the binding media getting eaten away, therefor less friction. Basically once the pad to rotor friction far exceeds the tire to pavement friction then there is problems.
For what it is worth I had ice-mode with the stock brakes and stock pads and RE-11 tires during auto-x, but only once the brakes got hot and on longer 90 second courses after about the 4th consecutive run. I'm guess that the bite of the pad just kept increasing due to the increasing heat.
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