Hissing sound issue from front suspension - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 05-25-2019, 05:24 PM Thread Starter
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Unhappy Hissing sound issue from front suspension

Hi Everyone,

i'm new to the forum and hope some one can help me based on the symptoms. My car is 2012 (S300) model. The dash displayed a warning message on the screen which i can't remember exactly but it was like "suspension fault". I cleared the fault and the message didn't come back again. The car drives fine. but i'm hearing a hissing sound when the car drives through the speed bumps. The hissing sound comes from the left front tire. It also makes the hiss noise when i raise the car up only. when the car is lowered then the hissing sound does not come. however hissing sounds is loud regardless if the car is lowered or raised during the bumps. i'm keeping the car in normal height for now.
I've searched through the forum for the key word air leaks but didn't find anything related to my issue. Can you some one share the links for a similar issues or guide me to on how to troubleshoot so that i can take it to a the workshop but not the stealership since there is only 1 in my region. I'm sure they'll tell me to change all the 4 air-matic , air compressor , sensor and all the kit.

Thank you
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post #2 of 5 (permalink) Old 05-25-2019, 06:18 PM
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With an airmatic suspension, it sounds as if there is a leak either in the left front strut, or in a line going to it. The links under airmatic at https://www.benzworld.org/forums/w22...-steering.html may be helpful to you.
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Warren

2013 S550

Formerly:
2010 S550
2005 S500 4-Matic
2000 S500
1978 450SL
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post #3 of 5 (permalink) Old 05-26-2019, 12:36 PM Thread Starter
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Thank you Warren for sharing the useful link. I went through some of them quickly and had few questions.

-What is the difference between Airmatic and 4matic struts? How do i find out which one is installed in my car. My model is 2012 S300 (rear wheel drive i think).

-How reliable are the Arnott struts? hope they are not after market chines.
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post #4 of 5 (permalink) Old 05-26-2019, 01:02 PM Thread Starter
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Quote:
Originally Posted by QDoha View Post
Thank you Warren for sharing the useful link. I went through some of them quickly and had few questions.

-What is the difference between Airmatic and 4matic struts? How do i find out which one is installed in my car. My model is 2012 S300 (rear wheel drive i think).

-How reliable are the Arnott struts? hope they are not after market chines.

-What software would you recommend to scan the codes? i think at this stage its easier to pay for the software online and get the cable.
thanks
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post #5 of 5 (permalink) Old 05-27-2019, 04:55 AM
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Airmatic is a pneumatic suspension system. 4Matic refers to the drive train. The struts differ somewhat in their exterior configuration to accommodate the different layout of the two drive systems. Internally, they function the same; but you must get the proper struts or they will not fit.

In North America 4Matic cars carry labels on the body (usually the trunk) indicating that they are 4Matic. That may not be true everywhere. If you cannot get good data from a Vehicle Data Card (using one of the VIN decoders shown in our DIY & FAQs General Info section) a good way to confirm is to look for drive axles and CV joints on the front wheels. If your front wheels do not have a drive shaft that connects to a front differential, and CV joints, then you do not have 4Matic.

Arnott struts are of very high quality. Newly manufactured ones may lack the ability to adjust the ride stiffness; remanufactured ones usually have this ability. It is something you will want to check.
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Warren

2013 S550

Formerly:
2010 S550
2005 S500 4-Matic
2000 S500
1978 450SL

Last edited by Skylaw; 05-28-2019 at 09:29 AM.
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