On the issue of cooling the brakes this should be done by letting them cool down WITHOUT assistance from the fire crews water or foam as the thermal shock may result in the wheel exploding ,if the landing gear is on fire this should be put out with dry powder.
I suspect that a fine water mist could be used to cool the landing gear but i,m not sure that i would want to be the first to try it as a hot wheel with a tyre at 200psi (cold) could be described as an unexpolded bomb !.