Warning lights, P0A93, no AC, cruise, brakes not working correctly..

My father gave me his 2008 Prius a few months ago (83,000 miles). Only problem mechanically was I had to replace the triple coolant valve. Been all good since (3-4k miles). Today on the freeway, got the Red triangle of death, VSC, check engine light,and the red car with the ! on the corner of the main screen. A/C and cruise stopped working. After a few minutes, both the brake warning lights and the ABS light came on as well. The brakes were not working properly, but I made it home. I checked codes and the only one was P0A93 for the inverter pump. Hybrid battery monitor was normal all the way home. Regular battery is at 13.35v when it's running/on, and 11.70v when not. Starts fine, windows work, etc. I cleared code and drove around for a bit. Everything worked except the A/C blowing hot. After a few minutes, everything happened again. Same symptoms, lights, and same code. Do you think it could just be the inverter pump? Or is there more to this than that?
Thanks in advance.

 

I ordered a pump, should be here tomorrow. Hopefully that's all that's wrong. I still have a gallon of coolant. I thought I read that if the AM2 fuse went, nothing would turn on. I'll check it before I try to start it again.

 

I had read about testing the pump. I tried it. Turned on "ready" and the pump did nothing. I grabbed a cheap pump off Amazon just to use for troubleshooting. It's an easy swap so I'll try it and assuming it works. I'll order the OEM Toyota one and replace it again when it cools off. I'm in AZ..

 

I was thinking (possibly incorrectly) that if the inverter was shutting down other extremities like cruise, A/C, and maybe even the brakes (still don't get that one), maybe the 12v battery was being drained more than normally for other things.. Not feasible??
As far as the battery life, yes, it's AZ and if we get 4 years out of a battery, we cheer.. That is a big part of why my father gave me the car. He drove it so little that everytime he went to go somewhere, he had to jump it or replace the battery. I'm pretty sure it's a newer battery. I'll look at the date, and maybe charge it to get tested if need be.

 

It's pretty insane to me, and a huge safety issue, that the braking is rendered inefficient, or even almost useless when the car is still driving. When I said the brakes were not working properly, I meant I almost hit a car stopped in front of me because there were no type of power brakes. Felt like a 1960 truck with no power brakes. Had to basically push the pedal to the floor which locked up the rears and did nothing in the front. Luckily he turned and I slowly crept the last 1/2 mile home. But at the last turn to my house, when I hit the brakes, it lurched forward and then the car shut off. Again, luckily, nobody was there and I coasted to the front of my house. After it cooled off some and I was testing it, brakes worked right again.

And I'm pretty sure the 12v battery is fine. I had to drive about 10 miles home so I'm sure it drained some but will be fine after I charge it.

 

Just to close this out, I replaced the inverte4 coolant pump and all is right with the world. Battery is fine. Thanks all for your help and advice.