Brake Temps...
Brakes are devices that convert kinetic energy to heat energy. I don't have the reference with me (I'm in Asia, and my manuals are back in the U.S.), but, generally, the complete transfer of heat energy throughout the brake and wheel assemblies occurs approximately (on average) 30 minutes after landing.
Thus, if you have an aircraft equipped with brake temp indicators, you'll see the temp peak out about 30 minutes after landing. Brake fans, stiff winds, etc. all contribute to the reduction of that actual peak temperature, but the peak still occurs about this point in time...whatever that specific temperature may be.
Chocks in place, correctly or incorrectly placed, is an irrelevent issue.
Further, if you have brake fans, and you're using them, take note not to switch off the fans too soon. A common mistake is to (say 20 minutes after landing and maybe 15 minutes after brake fan activation) turn off the fans, thinking the temps have decreased to an acceptable value...only to see the temps rise, again, and peak at that 30 minute point.
Thus, it is perfectly normal to see the temps rise...chocked or not, fans or not...after gate arrival.
Regards,
Tom