well, i'm guessing that if it suddenly failed, power steering fluid eats rubber... at least M/C seal rubber. pull it apart and rebuild your master, pretty cheap. take a look at your flex lines while its off, and see if any fragments come out of them. try bleeding them again, take a large syringe and pump the fluid from the calipers through to the master. this is how bicycle brakes are bled and its the easiest and best method i've found for the heep too, it pushed bubbles UP instead of down...
Actually, you will need to replace ALL THE RUBBER PARTS in the ENTIRE BRAKE SYSTEM, as NONE OF THEM are tolerant of power steering fluid, which is a type of OIL.
Brake fluid is a type of ALCOHOL, and thus rubber parts in brake systems are geared around being tolerant of that type of chemical.
You will need:
1. new rear wheel cylinders (or seal kits for them)
2. new front calipers (or seal kits for them)
3. a new master cylinder (or a seal kit for it)
4 new front brake hoses
5. a new rear brake hose
Finding seal kits is problematic nowadays, since no one rebuilds calipers or wheel cylinders themselves (it's more cost effective to just buy reman'd ones)
Good luck on your overhaul. I am betting you will NEVER make that simple, but critical, mistake again.