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Old 07-08-2012, 06:19 AM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 21,234
Mein Auto: 02 BMW 525i M54 auto 130K
JimLev kindly autopsied a power steering hose at the midline clamp to show the restrictor inside:
> E39 (1997 - 2003) > ps hose

"What is this clamp in the middle of my power steering pump hose?"

Originally Posted by JimLev View Post
It's a clamp over the restrictor
Originally Posted by gibo58 View Post
What purpose does that restrictor serve?
Originally Posted by JimLev View Post
Just a guess, as the pump increases in RPM there is more PS fluid pumped to the steering box which makes steering easier. Once you get to some higher RPM the restrictor starts to limit the flow which limits the amount of assist from the pump. Anybody got a better answer?
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