How to flush power steering pump on W115? - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 06-14-2015, 01:51 AM Thread Starter
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How to flush power steering pump on W115?

My power steering is squealing. I want to replace the filter and flush all the old fluid out of the system. It doesn't appear to be leaking but the fluid is a little under the line. I think I've located the high & low pressure lines, could be totally wrong. There are a few black lines with the same metal clamps on them so the low pressure line could be any of those. The two lines I'm pointing two are the ones with dust on them and there the only ones that seem to connect to the pump. I know I have to remove the low pressure line and I do not touch the high pressure line. Of coarse I'd discount the LP line from the other end. Also could anyone recommend what power steering fluid works great with these W115's. I've read Genuine Mercedes brand is the one to get.

Low Pressure:

High Pressure:

Call me Ben! Formally "Mercedes Lover"

Last edited by Shakedown Street; 06-14-2015 at 02:39 AM.
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post #2 of 3 (permalink) Old 06-14-2015, 04:08 AM
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post #3 of 3 (permalink) Old 06-14-2015, 12:22 PM
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Ben your low pressure line is the one held on with a hose clip ,and a screwdriver will remove it ,the high pressure is a fixed nut to the hose tube. All i had was a syringe pop it in suck all oil out , untill you can remove your old filter. Remove it fill up start the car turn wheels left and right a few times This i did on and off for 2 litres of power steering fluid mb own make .By the way it is PAS fluid and not ATF Then the next time its low pop in you new filter top it up to the mark . Now this is ok if you dont have oil adjustable suspension.But as above visit youtube both ways to do it is on there .

This is a retro ride .
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