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Concerning parking brakes on jets, I've never flown a Transport Category aircraft that doesn't have some sort of hydraulic accumulator that hold pressure in the system for some major period of time (many hours), and which allows a certain number of emergency brake applications before running out of pressure. The jet I currently fly has a emergency/parking brake accumulator that allows up to 24 hours of brake pressure or at least six applications of the parking brake.
I can't directly speak for the 777, but I have a hard time believing it doesn't have a similar system. Why the emergency/parking brake was not applied is beyond me.
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