I swapped my ram over to disc brakes 3months ago I also replaced the Master Cylinder and Hydro booster and replaced all the lines, calipers, rotors and pads at the same time . After a week the hydrobooster blew out the accumulator seal and I lost all my power steering fluid in about 2mins. I warrantied it out and replaced it and I couldn't get a good pedal what so ever ,so I bought a oem  master and hydrobooster. I installed them yesterday and I still can get a good pedal after bleeding it. If I pump the brakes a few times it has full power but after driving it a few feet afterwards it loses pressure. Should I replace that power steering pump, or is there something else I should do. Everything worked like a dream before the booster blew.

 Not up to speed on how that all works together but watching this thread to learn. 

 Someone that knows more should be along soon. 

 

@Haggarand @wil440 have more knowledge about it then me and will be along to help but here are a couple of links that might help in the meantime. 

https://my.cardone.com/techdocs/PT 52-0001.pdf

 

https://www.underhoodservice.com/operation-diagnosis-and-repair-of-hydro-boost-power-assist-systems/

I'd be checking the relief valve in the back of the PS pump, mine stuck open slightly and caused the power steering and brakes to have very little power at all, could be possible that yours the first time stuck shut (max pressure) Or it was just time for the hydroboost to leak, this time on your truck it does seem like the valve is sticking.

I actually replaced my PS pump with a reconditioned unit  BEFORE the valve stuck, on inspection it hadn't been replaced as it hadn't done anywhere near the amount of miles to get scored like it was, I polished it with very fine wet and dry and it's never stuck since, I also did the valve mod thats on here somewhere which intails drilling out the small delivery hole a little but I had a spare valve anyway that I could use if things went pear shaped,  I wouldn't recommend the valve mod unless another valve is on hand.

Valve is on the back of the pump under where the pressure line connects, just disconnect the pressure line and then the bigger boss it screws into is the valve, remove that and you will see the small nut with a filter inside, clean the filter as that can cause bad steering, then check the actual valve.

I decided im going swap out the PS pump, since i was planning on doing to tappet cover gasket anyway 

Best to pull the VP44 to do it right. I've got both articles on pulling the VP44 and doing the tappet cover.

Thats what im planning on doing, tappet cover isnt hard at all to do. Ive done it on other trucks many times