When I park my 2014 C300 4MATIC Sport 4DR and I leave it for a hour or so and I begin to drive I hear a grinding noise coming from the front end soon as I start driving it again.

The noise is only apparent within the first 60 seconds of driving and I can feel a vibration in the steering wheel and underneath my feet. The car isn't shaking and it's not a super loud grind but it is definitely noticeable from the drivers seat that something isn't right.

After about 15-20 seconds of the grinding which feels to be in sync with the turning of the wheels, it stops and disappears. The grinding is only present when driving under 15 KM/H and without the brakes being pressed. Even if I stop and start the car the sound does not reappear, until its been sitting for awhile.. (sometimes it doesn't come back until the next day)

The other day as I was leaving an underground parking lot after being parked for about 1 hour. While driving up the ramps to the high levels to exit the grinding sound was present, upon reaching the exit and going onto the street the noise was gone.

The grind started out happening once a few months back once in a parking lot but disappeared after 15 seconds. I ruled this to be the parking lot and not the car as it didn't come back. (I cannot remember the season this happened).

A few weeks ago, I had a alignment performed as well as brand new Conti DWS06 tires installed. Everything was great until the past 14 days. Since then the grind has now appeared more frequently from 2-3 times per week to now 3-5 times per week. I have confirmed tire pressure to MB spec. The brakes are in fair condition with Zimmerman rotors and CarQuest Wearever Platinum Pads. There is still a few months left in these.

The grind sound appears if the car is left for 12 hours or even 1 hour -- BUT does not appear every time. We are starting to get colder weather in Toronto, I'm not sure if this has anything to do with it.

When I was parked in the green P underground parking lot, it seemed somewhat heated and not " freezing cold" and it still made the grinding noise up the ramps.

I had the mechanic who performed the alignment test drive first thing in the morning after being parked all night and they were able to hear the noise. They lifted it up and everything looked fine. When they put it back down the sound was gone and they could not reproduce it.

Any Ideas?

 

could it be this?

ADAPTIVE BRAKE also improves safety in wet conditions: in the wet, the technology applies regular, brief braking impulses to wipe the film of water from the brake discs and ensure that the brakes are able to perform at their peak. The automatic brake drying function is always activated when the windscreen wipers of the E-Class have been operating for a certain time. The driver does not notice the finely metered braking impulses.

the post was old so I was wondering if it made it to the C-Class yet

 

Don't think so, it happens in wet and dry weather. More frequently after the alignment, not sure if it's related or not.

I don't think I have this feature on the C Class anyways.

 

 

 

Could this be the wheel bearings?

 

 

I've been having something similar happening with my 2012 C250. Everytime I let my car sit for a day or even overnight, upon starting, I feel and hear a rumbling sound that seems like it's coming from the engine Bay. I can feel it vibrating through my feet and the whole car. After about 30 to 45 sec. it subsides and is then smooth. Once the car is out and about, it'll start up just fine. It's only when I let it sit for a period of time. I let the vehicle run for a min because if I try and drive it immediately after starting, it makes this grinding noise and doesn't feel right. Any thoughts?

 

this is not the same issue I had in this thread, mine was while driving. Very light grinding not coming from the engine.

However I did notice this same issue later on in my car as similar to why you describe. From what I had read it has to do with oil pressure being lost in the piston or something. Rip the engine apart and change parts and some still reported it continued. MB says it’s “normal”

I had the same issue it would be fine all day but in the morning after starting it the first time after it sat for a few hours it would rumble and sound crazy for about 20-30 seconds. I fixed this by trading it in.


goodluck

heres the thread

https://mbworld.org/forums/c-class-w...nation-mb.html