What is the temperature of brake disks at maximum altitude of a jumbo like a 747 and airbus A380 for say a 10 hour flight. Does the temperature drop below zero and what is the effect on the metal material used on the disk from the sudden change in temperature from one extreme, below zero degrees celcius to over 700 degrees celcius when braking?
The temperature changes from altitude to ground are not (usually) rapid. Therefore the possible sub-zero to red-hot case is not as severe as may be thought. If carbon discs are the example, they require temps that are almost beyond steel discs braking capability.