Some of the videos here
http://www.aircraftbraking.com/SUP_Videos.php are quite good but they seem to want some drinking vouchers in exchange.
I believe the British Aerospace test pilots aledgedly found some interesting data when testing carbon brakes on the 146/RJ which is worth listening to. It was something along the lines of they are not very good and suffer excessive wear up to about 250 Deg C (Quite normal), are effective from 250 to around 600 Dec C, but then fade quite rapidly as the carbon gas pressure builds up between the plates at very high temperatures. However this is third hand information so do not use it as training or operational information. Perhaps a TP with better knowledge than I would care to comment?