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Does all power steering fluid eventually move through the whole P/S system? In other words, would a drop of new fluid placed in the reservoir eventually get pulled in to system and circulated around?

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Yes - the power steering system is a closed loop system. See the diagram below for the components of a typical hydraulic power steering system.

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  • Thanks, @Paulster. I think I got it, i.e. that any given drop of PSF anywhere in the system, including the refill reservoir, will eventually circulate through everywhere, but just so I am clear, where is the PSF reservoir in this diagram? Is it the same as the pump?
    – mblatz
    Feb 3, 2022 at 3:05
  • @mblatz The reservoir isn't shown in the diagram unfortunately. From my experience, the return pipe goes back to the reservoir and there is a feed from the reservoir to the pump. So any fluid in the reservoir is circulated through the system.
    – HandyHowie
    Feb 3, 2022 at 8:11
  • OK...I got it, HandyHowie...I appreciate the clarification. I'll take a look at my system and see if I can identify the lines involved.
    – mblatz
    Feb 4, 2022 at 14:39

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