Sudden loss of hydraulic brakes in a 2010 Prius known defect!

Yep all that happened now basically replacing about 1400 bux of firewall mounted brake parts. Unless the cars the real nice keeper probably not me. Personally we don't deal with this gen 3 business

 

D0H was a recall of some 2010s that shipped with bad accumulators. (The metal bellows inside was manufactured undersized, so it would bang around inside the can on bumpy roads, and develop early cracks.)

It was a recall, so it should have been performed on your car long ago. If you're sure that it wasn't performed, there's an easy way to look at the accumulator label to see if you had one of the bad ones or not.

ZJB was a customer satisfaction campaign for cases where the actuator (not accumulator) developed small internal leaks early.

Neither of those conditions would directly cause "lost all braking ability". The continuous beeping alarm, yes, and harder pedal effort to stop the car in the fail-safe braking mode.

By any chance, in time leading up to this, had you been noticing a rushing sound sometimes when applying or releasing the brakes, or a kind of quack / bark / honk saxophone-like sound when releasing the brakes?