Join Date: Jan 2006
Location: Northern California
Thanked 2,576 Times in 2,074 Posts
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The power steering pump powers the hydroboost system. The vacuum pump has nothing to do with either but merely is connected to the PS pump for a drive source.
If you're having trouble with the hydroboost system and/or the PS system then always check the PS fluid condition and level first. Its a small capacity system and the hydroboost runs hot so it degrades the fluid. Its best to run a quality synthetic PS fluid too.
'01 2500 Sport 4x4 5spd w/Fastcoolers, Mag-Hytec, EZ, RV275's, 4" w/o muffler, South Bend, Steering brace, aFe, 2 lo kit, Isspro Boost, FP, and EGT on pillar, Westach Trans/Diff temp gauge in dash pod, Raptor 100 w/ 1/2" line, Pac Brake, Rancho 9000, 285's