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The First Modern Car Without Hydraulic Brakes Is Headed to Production
(www.thedrive.com)
This is a most excellent place for technology news and articles.
The parking brake is an independent / redundant system. After the hydraulics have fully failed (which, no matter how well designed and built you think the system is, can still happen: https://en.wikipedia.org/wiki/United_Airlines_Flight_232 ), the cable actuated brakes can still serve to get the vehicle stopped more quickly and safely than opening the door and dragging your feet on the ground.