it does have an internal filter. if you fluid id full but bubbly and full of air replace the resivoir. i have replaced many of them for noise

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97 e320 200k!

85 300sd

96 c280 sport for parts! pm your needs

I wanted to post the results of changing the power steering reservoir to stop the “whining.” Yes, the reservoir replacement FIXED the problem! This forum once again is a wealth of knowledge!

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Russell McMahon
Tulsa, OK
2001 CLK 320
1992 400se
1993 400e
2000 320ML