Air in my Power Steering - 69 W114 - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 03-17-2011, 11:39 AM Thread Starter
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Vehicle: 1969 W114 250 /8
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Air in my Power Steering - 69 W114

Hi, I've apparently got air in my power steering system, as of late there's been some groaning and on inspection the reservoir fluid is foamed up.

I understand this can be solved by bleeding the system and refilling with ATF.

I have a chilton's repair guide but the pics are not the best so I would really appreciate a tip RE finding the right spot to bleed from and the best way to go about it. Help on finding the spot, especially with a picture to work from, would be ideal for this noob.

Other tips from those who have done this procedure would be great too. For example, on newer systems it is advised to work the wheels from side to side with the front end lifted to help work the air out of the system. Should I include that in the procedure?

Thanks very much for your responses,


PS - I know that the ultimate cause of the air in the system is a probably a leak, and I intend to source and correct that eventually. For now, I would like to get the air out and go from there to see if I can limp it along until I save the $$ to do the permanent fix.

1969 W114 250 /8
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post #2 of 5 (permalink) Old 03-17-2011, 06:07 PM
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too soon.

Last edited by Govert70227; 03-17-2011 at 06:10 PM.
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post #3 of 5 (permalink) Old 03-17-2011, 06:19 PM
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There's a bleeder on the steering gear, probably on the top close to the steering slack screw, might have a rubber cap over it, will look like a large brake bleeder screw.

-Open the bleeder up, attach hose to it, so it stays on!
-Start the car and turn the wheel while adding new fluid (best with two people).
-When dirty/foamy fluid stops coming out, turning the wheel both ways, tighten the bleeder back.
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post #4 of 5 (permalink) Old 03-17-2011, 08:44 PM
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Run the clear plastic line (you will get at the hardware store) from the bleeder into the power steering reservoir and (at idle) watch until the bubbles clear. crack the bleeder open to bleed and finger tighten or loosen while running to control the flow.

or dump the old into a jar, keep the res. filled. do not allow it to suck air.

Brian O
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post #5 of 5 (permalink) Old 03-18-2011, 05:22 AM
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Probably should mention I went through the same thing:

I bled it last year and it has sat all winter, drove it three days ago and the power steering still works fine, so if mine has a leak its VERY slow. Personally I think the previous owner tried to change the fluid, let it get air in it and didn't realize there was a bleeder. But I don't know your situation...
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