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it replaces your vacuum brake booster with an power steering fluid actuated one. It taps into the return line of the power steering pump. It does take away your power steering.
I don't know if Jim meant this just as it is written or it came across wrong or I just misread but I'd like to clarify that you still have power steering with hydroboost. The pressure line from your PS pump feeds into the hydrobooster and then it has 2 lines that come out of it, a high pressure which then goes to your steering box (so you still have power steering) and a low pressure return that goes back to the resevoir or pump. The brake booster functions on very little volume, mostly just pressure so it doesn't take away from the power steering. I run a hydrobooster, hydro assist cylinder and a steering box off my pump, works great.
1. The hydrobooster provides a lot more pressure making it much easier to stop 44's.
2. The diameter of the hydrobooster is far smaller than the vacuum booster so it'll clear my valve covers.
3. My engine barely pulls any vacuum as is, so it was tough to get anything out of the vac booster.
Never done a hydroboost on a ford, put a couple of them on chevies that didn't come with them and a friend has one on his early bronco for the same reason of having no vacuum. They work like a champ and beat the heck out of a vacuum booster. Completely changes the pedal feel and effort required to stop a big truck. They do however make for a jungle of hydraulic lines and the units are not cheap to rebuild, but they are easy to find in good used shape.