Power steering

[Inspignant]

Greetings enthusiasts and gurus!

I had power steering and brakes go out on me here a while back. I changed the power steering pump and vacuum bled the system. Power steering was great for about a month but was slowly getting worse again. I ended up changing out the pump again as well as the two high pressure and one low return lines. Again I got the same results and it's getting bad again. There are no leaks, fluid is at the proper level and I see no bubbling in the reservoir. Is it possible that the hydroboost could be the culprit?