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Noise When Going Over Dips

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Old Mar 21, 2023 | 02:43 PM
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Noise When Going Over Dips

Is this a normal noise when hitting a dip at about 45mph? It also makes the noise with the suspension raised. This dip is in my neighborhood and I hit it daily.

The car only has 35k miles on it. I think the tires are rubbing the inner wheel well covers. The dealership says they cannot recreate the issue and the suspension looks good., No codes.

Any help is greatly appreciated.


Last edited by steinjr; Mar 21, 2023 at 03:05 PM.
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Old Mar 21, 2023 | 03:09 PM
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any sign of the tire rubbing the wheel well liner? That definitely doesn't sound normal.
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Old Mar 21, 2023 | 03:26 PM
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Paint the wheel wells at the presumed contact points with white latex paint (you can paint thin wash it later) and drive ... see if you get paint on tires after first audible bump
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Old Mar 21, 2023 | 04:12 PM
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Originally Posted by jcat
any sign of the tire rubbing the wheel well liner? That definitely doesn't sound normal.
Yes, there are striation marks. How could Mercedes miss this when a car is brought in for possible suspension issues?





Last edited by steinjr; Mar 21, 2023 at 04:21 PM.
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Old Mar 21, 2023 | 08:22 PM
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If a sudden suspension movement causes a squeaking or crunching sound, it's probably worn out front suspension arms. The bushings and/or ball joints tend to start making noise around 50k miles.
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Old Mar 22, 2023 | 09:24 AM
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Originally Posted by steinjr
Is this a normal noise when hitting a dip at about 45mph? It also makes the noise with the suspension raised. This dip is in my neighborhood and I hit it daily.

The car only has 35k miles on it. I think the tires are rubbing the inner wheel well covers. The dealership says they cannot recreate the issue and the suspension looks good., No codes.

Any help is greatly appreciated.

http://youtu.be/IpIcZp4tRdg
My 2014 does the same thing. Never had it looked at yet.
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Old Mar 22, 2023 | 09:28 AM
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Originally Posted by steinjr
Yes, there are striation marks. How could Mercedes miss this when a car is brought in for possible suspension issues?



The photo just shows normal lines from wheel slinging dirt and water. it is almost impossible for the wheel to hit the way you show. Trust me if it did, you would not have the simple squeak. I would agree with Tom.

I'm glad you nailed the recording. Hopefully someone will chime on with the proper fix as I'm sure this in common, It started on my car about 45K.

Last edited by Nice Ride; Mar 22, 2023 at 09:31 AM.
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Old Mar 22, 2023 | 09:29 AM
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Those "striation" marks look more like ribs in the wheel liner. Noises like this are typically a worn suspension component or possibly a strut. I had an airmatic strut that would "clunk" over certain speedbumps at certain speeds. A good alignment shop should be able to diagnose this.
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Old Mar 22, 2023 | 09:42 AM
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Originally Posted by Tom in Austin
If a sudden suspension movement causes a squeaking or crunching sound, it's probably worn out front suspension arms. The bushings and/or ball joints tend to start making noise around 50k miles.
The dealership stated they found nothing wrong with my suspension. They also won't say if this is normal. So I am kinda in limbo about whether it needs to be fixed or not.
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Old Mar 22, 2023 | 09:44 AM
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Originally Posted by Nice Ride
The photo just shows normal lines from wheel slinging dirt and water. it is almost impossible for the wheel to hit the way you show. Trust me if it did, you would not have the simple squeak. I would agree with Tom.

I'm glad you nailed the recording. Hopefully someone will chime on with the proper fix as I'm sure this in common, It started on my car about 45K.
I never thought about the tires slinging water and dirt leaving a pattern. This makes sense.
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Old Mar 22, 2023 | 01:10 PM
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I think you need to take it to an indy and have them get it up on the lift and move things around, see if it can be reproduced.

are those 20" wheels? If so what are the tire sizes?
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Old Mar 22, 2023 | 02:01 PM
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Originally Posted by jcat
I think you need to take it to an indy and have them get it up on the lift and move things around, see if it can be reproduced.

are those 20" wheels? If so what are the tire sizes?
Everything is stock.
20" wheels
Front Tires - 245/40 R20
Rear Tires - 275/35 R20
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Old Mar 22, 2023 | 08:57 PM
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I had a 2015 with only 39k and rear air struts went bad, then at about 42k I noticed the fronts going bad. Pretty annoying not to get more mileage out of them as the fronts are around $1,200 each installed and the rears are about $1,500 each... Good luck!
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Old Mar 23, 2023 | 03:26 AM
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My W212 had a similar noise with 17" Continental (non DWS ) tires . I switched to Michelin Primacy Series and all of those noise gone away
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Old Mar 23, 2023 | 12:19 PM
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Definitely not normal but not tire rubbing.
I would suspect roll bar bushings, disconnect drop links and test (note cornering dynamics are severely altered with sway bar disconnected).
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Old Mar 30, 2023 | 05:53 PM
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The service manager went for a ride with me today and we were able to replicate the noise. He states it’s a strut. Now they just have to figure out which one.

If it is only a single strut, do you have any advice on how I can get them both replaced under warranty?
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Old Mar 30, 2023 | 06:33 PM
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Depends on the warranty company as some do not cover struts or what they refer to as shocks as they see them as a wear item. Reman units can be had for around 500 bucks a pop and I did one on my last S550. Pretty easy job if you have a jack and some hand tools. Either way, good luck with the repair.
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Old Mar 30, 2023 | 08:10 PM
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Originally Posted by steinjr
The service manager went for a ride with me today and we were able to replicate the noise. He states it’s a strut. Now they just have to figure out which one.

If it is only a single strut, do you have any advice on how I can get them both replaced under warranty?
Who is the warranty company? A single strut warranty claim shouldn't be an issue, the issue is when repair facilities try to replace all 4 corners when only one needed to be replaced.
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Old Mar 30, 2023 | 09:29 PM
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I had a similar sound in my 1995 Q45. It ended up being air in one of the shocks.
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Old Mar 31, 2023 | 12:27 PM
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Originally Posted by superpop
Depends on the warranty company as some do not cover struts or what they refer to as shocks as they see them as a wear item. Reman units can be had for around 500 bucks a pop and I did one on my last S550. Pretty easy job if you have a jack and some hand tools. Either way, good luck with the repair.
Originally Posted by Highline-Autos.com
Who is the warranty company? A single strut warranty claim shouldn't be an issue, the issue is when repair facilities try to replace all 4 corners when only one needed to be replaced.
The extended warranty is through Portfolio Protection through Assurant and Struts are covered.

FRONT SUSPENSION
Struts; upper and lower control arms and shafts and bushings; upper and lower ball joints; stabilizer shaft, linkage, and bushings; spindles and supports; wheel bearings.
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Old Mar 31, 2023 | 12:43 PM
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This would be a hard sell, official MB procedure for air struts is to replace only the defective side.
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Old Apr 2, 2023 | 01:39 PM
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OP.... bushings at top of struts. Serviced by replacing struts.

Marks in wheel liners? The tires toss off water with dirt in a pattern that mimics the tire’s void spaces. Utterly normal.
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Old Apr 2, 2023 | 03:59 PM
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Originally Posted by JohnLane
OP.... bushings at top of struts. Serviced by replacing struts.

Marks in wheel liners? The tires toss off water with dirt in a pattern that mimics the tire’s void spaces. Utterly normal.
You think you can spray some Grease or Silicone to swell the bushing?
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Old Apr 11, 2023 | 02:37 PM
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Dropped the car off at the dealership again. They really seem hesitant to want to figure this noise out and take my money.

They talked about the process to figure out if it's a strut and made it seem cumbersome. Did you know they have "ears" (microphones) they attach to the struts to determine which one is making noise?

Then they mentioned the warranty company will most likely have a rep out to verify the problem and solution. Probably deny the repair. I have paid for noncovered repairs in the past on several occasions. Been using this dealership for 10 years or so.

Then they tell me ... without really knowing what is causing the noise... it's not causing any damage and doesn't really need to be fixed.

Am I the only one of us that would want to have this resolved?
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Old Apr 12, 2023 | 10:03 AM
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a) Thanks for the status update
b) Didn't know about the microphone but that certainly is a good idea
c) I would ask them how much for the diagnosis
d) Review your warranty policy for whether the air struts will be covered
e) Yes I would want it repaired. Its an S Class
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