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but then the fact that you can also run much lower pressures than a tubed setup probably means it won't be an issue in the first place.
I don't understand why anyone would run road tyres at such a low pressure that they would start to bottom them out.
The pressure stuff makes sense on MTBs and cross / gravs when a spot of skill deficit might result connection with a blunt object and a bottom out, but on road this ain't gonna happen unless huge potholes that will probably off you from the bike and break your wheel anyway.
Howard-
Nothing to do with bottoming them out. At 112kg, I can run 25/28c road tubeless at 85-95psi which means that even if the brake track were to heat up the air inside quite substantially it wouldn't get to a dangerous pressure level.
With tubes, things feel horrendously sketchy at that pressure, soi have to run 25/28c tires at 110+ to stop squirm or tire flop while cornering. At that pressure I've had two blowouts on long descents.
Mu_Mu
I'd hazard a guess that tubeless would deal with high rim temperatures/pressure buildup better than a tube, but then the fact that you can also run much lower pressures than a tubed setup probably means it won't be an issue in the first place.
And as you're 65kg you don't really need to use brakes very much anyway. Just sit up and open your jersey like a parachute.
Lennard Zinn's take on it: http://www.velonews.com/2010/01/bikes-and-tech/technical-faq/technical-faq-avoiding-that-frightening-blow-out_103005