kimoscout

I have a 2006 Chevrolet Suburban 5.3, 4WD. I had a leaking Hydro booster for several years so I replaced it thinking it was the problem, but no. The power steering pump reservoir never ran dry, so no air in lines that I can think of. It has a pulsating vibration when turning the steering wheel in Park and while driving. It also has that same pulsating vibration when braking in Park or while driving. It is full on brake fluid and power steering fluid, no visible leaks anywhere. Wondering if its a bad power steering pump or worst case scenario, the steering box???? One guy told me to check the ABS but it does this in park or drive and not just when braking. Any help would be much appreciated. Thanks.