Power steering - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 03-09-2015, 09:21 AM Thread Starter
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Power steering

Hi everyone, I'm new. I have a question about power steering. I have a 06 ml500, recently I noticed that the steering wheel have me a minute noise while I was turning on low speed. My first thought is that there might be not enough power steering fluid in the pump. So, I checked the dip stick, the level is at the minimum.
So, I went to Autozone and bought some Power Steering + Stop Leak Fluid, and put it into my car on Saturday.
On the Monday, I was trying to drive to work, when I turned it on, I felt that my steering wheel is very very heavy, it feels like it doesn't have power steering at all. I couldn't even drive it. So, I cannot even use it for now.
I asked someone, they say it might be the fluid that I put in. I randomly picked some brand and put it in, I thought they don't require a special kind of fluid. I have noticed the mistake. I need your help and experience on how to get it fixed, and what kind or brand of power steering fluid show I buy to put in.( please be specific) thank you very much .
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post #2 of 7 (permalink) Old 03-09-2015, 11:07 AM
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Welcome to the forum.
You should come here before doing the fix, not after you put sealer in the system.
MB have very precise machinery in them and putting stuff design for Chevy is often backfiring.
Now you should do proper flushing and do the job right.
MB PS fluid cost about $10, so taking your chance to save couple of bucks make no logic sense.
Even when newer models use $20 PS fluid.

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post #3 of 7 (permalink) Old 03-09-2015, 11:41 AM
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Generally speaking, putting "random brand" anything into a Mercedes is less than advisable.

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post #4 of 7 (permalink) Old 03-09-2015, 12:53 PM
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Quote:
Originally Posted by David-2014 View Post
Hi everyone, I'm new. I have a question about power steering. I have a 06 ml500, recently I noticed that the steering wheel have me a minute noise while I was turning on low speed. My first thought is that there might be not enough power steering fluid in the pump. So, I checked the dip stick, the level is at the minimum.
So, I went to Autozone and bought some Power Steering + Stop Leak Fluid, and put it into my car on Saturday.
On the Monday, I was trying to drive to work, when I turned it on, I felt that my steering wheel is very very heavy, it feels like it doesn't have power steering at all. I couldn't even drive it. So, I cannot even use it for now.
I asked someone, they say it might be the fluid that I put in. I randomly picked some brand and put it in, I thought they don't require a special kind of fluid. I have noticed the mistake. I need your help and experience on how to get it fixed, and what kind or brand of power steering fluid show I buy to put in.( please be specific) thank you very much .

Your ML takes Genuine Mercedes Fluid Q1460001 which is super cheap at ~$12.99 a quart. Stop leak may have done irreparable damn to your seals however I'd start with trying to located the leak and repair it and then flush ~5 liters of fresh fluid through the system.

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post #5 of 7 (permalink) Old 03-10-2015, 05:31 AM
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If this is your first Mercedes I can appreciate your comments. At low RPM Mercedes steering may seem heavy. This, in my experience, is just normal for the marque.
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post #6 of 7 (permalink) Old 03-10-2015, 09:39 AM Thread Starter
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Thank You for all ur comments and help. This is my first MB, and I don't have much experience about it. The issue has been resolved. I will change power steering fluid with some Pentosin (autozone ppl suggest me use this one, they said is generally for Germany cars). Any comments on this brand of hydraulic fluid ? Thank you!
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post #7 of 7 (permalink) Old 03-10-2015, 09:41 AM
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Reply for David

Hi David and welcome to this forum. Considering your steering fluid level was only at the low line and only adding a little fluid to top it off I dont think you did any damage to your steering yet. Although adding any steering fluid with stop leak in it is a big no no. As it will swell the seals and make them deteriorate faster than normal wear. A flush is advisable.
Now lets get to your real problem. It sounds to me like you lost all power in your steering. So the first thing to check is your belt tension. It should be tight and not loose. Belt tensioners on MB do fail. Leaving the belt loose. Another thing to look for is contamination on the belt itself, like the belt covered in oil. This will cause major slipping and a hard steering wheel. Usually when this happens your dash board will light up like a Christmas tree with the battery light on, and other warning lights on. A tell tale sign of a thrown or missing belt. If you check the belt and tension and all that looks good. Then the problem will be in the steering pump or rack n pinion. In that case I would get it to a shop. Pumps rarely fail and sometimes the racks can have a valve problem problem. Sometimes the High pressure hoses have a restrictor built into them that gets clogged so there are many variables. I hope in your case its just a belt problem. Well let us know how things turn out.
PS Pentosin is good fluid. And owning a Mercedes please do not take your car to a Goodyear or Firestone or any shop that mainly works on American cars as those guys will cause more damage than good. Find a reputable MB shop and dont be too cheap for your own good. As being cheap usually costs double. (Thats a general statement and not meant as an insult as I dont know you at all) Good luck!

Last edited by Vegasbenztech777; 03-10-2015 at 09:46 AM.
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