B777 doesn't like tow truck

[gearlever]

Originally Posted by Uplinker

As Check Airman asks: surely there must be a brake accumulator and a battery driven electric hydraulic pump for the parking brake, at least?

I don’t know the B777 systems, can anybody comment?

Brake accumulator YES, but no elec DC pump for brake system/accu.

[Capt Quentin McHale]

Brake system accumulator supposedly allows approximately 6 brake applications when fully charged. Surely when towing an aircraft "deadship" one would supply EXT PWR and charge the brake system accumulator first BEFORE carrying out said towing operation. Am I missing something here?

Rgds McHale.