Q&A

Goodness, you have a major problem.
Power steering (or similar) fluid in your brake system means that you have to literally replace everything that's rubber. From the master cylinder, to the rubber front and rear hoses, to the calipers, to the wheel cylinders... A good flush and bleed of the system must also be done prior to installation of new parts so as to not contaminate them too.

It's a zero tolerance issue - you must replace these items due to the contamination.