Suspension hydraulic blow out. - Mercedes-Benz Forum
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post #1 of 17 (permalink) Old 08-13-2018, 09:15 AM Thread Starter
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Suspension hydraulic blow out.

Hello. I’m new here. I’d like to say hello and hope to learn a lot from all of you gents. I recently acquired a 2005 SL55. I was driving around the block yesterday when suddenly there was almost like an explosion or high pressure tire. Then I see fluid flows out on the road. Once limped home for one street block. There was fluid coming out from the left side vent grill and dripping all along the lower left side of the car. I understand that there are two main accumulators located in this area. I’d like to ask. Does fluid gets spray out like that when main accumulators fails, or does it sounds like one of the line has ruptured? I haven’t got a chance to open up the left wheel well cover or fender to inspect it yet. Thank you all for any tips and info in advance.
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post #2 of 17 (permalink) Old 08-13-2018, 09:42 AM
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Welcome to the forum and sorry to hear of your misfortune.
Please list your car and location in the user details for future reference. Helps to determine the fixes to the issues.

Most likely the line burst from the pump to the first accumulator. I have not ever heard of an accumulator bursting.

Pull the wheel and the wheel liner, and see where the problem is. Then search the forum for others who have had to replace the parts.
I would recommend replacing the accumulator while you are in there. If over 80K miles, it is due for replacement.
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post #3 of 17 (permalink) Old 08-13-2018, 09:50 AM Thread Starter
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Welcome to the forum and sorry to hear of your misfortune.
Please list your car and location in the user details for future reference. Helps to determine the fixes to the issues.

Most likely the line burst from the pump to the first accumulator. I have not ever heard of an accumulator bursting.

Pull the wheel and the wheel liner, and see where the problem is. Then search the forum for others who have had to replace the parts.
I would recommend replacing the accumulator while you are in there. If over 80K miles, it is due for replacement.


Thank you for your reply. I will definitely do what you suggested after work today. Fun times even before I could enjoy the car. 🙂.
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post #4 of 17 (permalink) Old 08-13-2018, 05:49 PM Thread Starter
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Hi gents. I have found the blown hose. I couldn’t read all of the numbers stamped on the metal portion of it to identify the part number. As you can see in the picture. It is the second hose that goes to the Pulsation Dampener / Pressure Limiting Sensor located just inside the left fender near the vent grill. Could someone please guide me to the right part number for this hose? I thank you all in advance.
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post #5 of 17 (permalink) Old 08-13-2018, 08:17 PM
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Refer to these:

http://benzbits.com/r230/ABCFrontVal...rtsDiagram.pdf
http://benzbits.com/r230/ABCFrontVal...sPartsList.pdf

I think it's part #340, so A2309973282.

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post #6 of 17 (permalink) Old 08-13-2018, 09:26 PM Thread Starter
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Thank you for the info. I think that’s what the hose looks like.
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post #7 of 17 (permalink) Old 08-15-2018, 06:19 AM
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FYI - conventional wisdom says there is a possibility the hose burst because the accumulator your finger is pointing to may be blown.

That accumulator takes the pressure pulses from the pump and dampens them out. If it is blown, the pressure spikes then go to the line that burst, and it eventually fails.
That is why it is a good idea to replace this accumulator at 10 years or 80K miles. Any longer and you take the risk of blowing a hose.

The only test I know of for the accumulator is to press a pencil (or screwdriver) in and see how far it goes in. If very short insertion, it is good; if bad it goes way in, and shows the diaphragm is not holding pressure. You could easily remove it when doing the hose to test it.
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post #8 of 17 (permalink) Old 08-15-2018, 07:21 AM Thread Starter
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Originally Posted by kbob999 View Post
FYI - conventional wisdom says there is a possibility the hose burst because the accumulator your finger is pointing to may be blown.

That accumulator takes the pressure pulses from the pump and dampens them out. If it is blown, the pressure spikes then go to the line that burst, and it eventually fails.
That is why it is a good idea to replace this accumulator at 10 years or 80K miles. Any longer and you take the risk of blowing a hose.

The only test I know of for the accumulator is to press a pencil (or screwdriver) in and see how far it goes in. If very short insertion, it is good; if bad it goes way in, and shows the diaphragm is not holding pressure. You could easily remove it when doing the hose to test it.

Thank you for the info. The accumulator is on order.
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post #9 of 17 (permalink) Old 08-16-2018, 05:41 PM
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I think 10 years and 80,000 is pushing it without changing the accumulators. Maybe half that time or more often. Certainly is cheap insurance. I just replaced the damper and front accumulator (both were bad). The rears were done less than a year ago. I think that contributed to my expansion hose weeping. I need to pull it and build a new one but the WIS does not show the procedure, just a picture of it. Looks like it connects to the pump and is accessible after pulling the left air cleaner maybe more.
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post #10 of 17 (permalink) Old 08-17-2018, 08:55 PM Thread Starter
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Hi guys.
I replaced the hose and the Damperner accumulator today. Will fill it and flush sometime this weekend when time permits. Will keep you guys posted. The removed accumulator is still intact.
I tried to push the diaphragm down but couldn’t, but I changed it out anyway. Will see if any leaks once flushed and refilled. I’d like to ask if anyone had seen this hose ruptured like this without having a faulty accumulator before? If so, what is the likely causes of it? I’m just trying to learn about it. My car is at 54000 miles currently. Thanks all.
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