re: Mechanics of the OT: Brake drums

Nah it's really not, the disc brakes are hydraulic and the little drum set up on the backside is the cable operated e brake.

Old school drum brakes have the same set up (hydraulic and cable) but use the same shoes for both.



The little gif you posted actually shoes old shool e brake in action, if it was regular braking the shoes would be pushed out equally from a wheel cylinder at the top