Hello, I have a 09 C300 4matic that I replaced the right front axle. I didn't know it but the new axle doesn't have a tone or relucktor ring installed so that tire would actually lock up when there is no traction and the TCS turns on. I can't seem to find the correct tone ring to fix this. I just got a Dorman replacement tone ring but it doesn't fit the axle, it looks more like a replacement seal for the front wheel bearing. I'm lost...can anyone offer some advice here? Any help is greatly appreciated!!

 

I remember a thread on this before. This may answer your question.

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

 

Thanks Tim for the quick reply. I have read that post and it doesn't seem resolved. I believe the original poster just replaced the wheel sensors and that fixed the problem. There was no clear explanation on how to install those updated tone rings? It seems like the topic just went unresolved. Has anyone found a solution or can explain the install process for the tone ring on the front right axle of a 4matic?

 

What did it the old axle look like, do you still have it? Curious what it looks like, was there a separate ring on it? i almost want to say the tone ring is part of the axle. I really have no idea since i never worked on these axles before so no idea what it looks like other than the diagrams i posted. I cannot find a listing for a repalcement tone ring at all anywhere, except for the RWD models.

 

I don't have the original axle. I threw it out after I replaced it. Didn't think about the tone ring. I would have thought the new axle had one but it doesn't. Does the Dorman 917-570 install over the front wheel bearing on the 4matic? Has anyone installed one of these to fix the issue?

 

What is your complete model designation? 204.081? (Run your VIN through www.lastvin.com and check the top of the page for your datacard.)

 

2008 MERCEDES-BENZ C 280 4MATIC (204.081)

 

Anyone put a rear tone ring on the front axle?

 

Nothing in the EPC shows a separate tone ring (Pulse Ring) for the front axle, only the rear. Very perplexing since there are clearly sensors on all four wheels. You may need to reach out to autohausaz, pelicanparts, fcpeuro, or another merchant that knows the cars they sell parts for.

 

Exactly. Needs a tone ring to pick up signal. It's my understanding and makes sense that the original axle had one. I am starting to think that I may need to change the wheel bearing with one that has a reluctor ring in it. Can anyone confirm this?

 

Not sure the wheel bearing has the tone/pulse ring integrated. Here's the offering from FCP Euro:

https://www.fcpeuro.com/Mercedes~Ben...t=5&b=5&d=1043

 

In this video he shows a reluctor bearing....but you are correct...I don't see a bearing like this available anywhere. I am hoping someone must have ran into this same issue.

 

He's showing the reluctor/pulse ring is integrated into the wheel bearing. So, did you replace the wheel bearing? Were you actually having a problem?

 

My wheel bearings feel fine but since I put a new axle there is no tone ring so the traction control and abs systems are not working correctly. I am wondering if I now have to change the wheel bearing to one with a reluctor ring (that I can't seem to find)?

 

The thing is, your wheel bearing came with the ring from the factory. There was a part change in 2007-2008, but yours is a 2009. Can you provide the complete VIN to see if the car was actually manufactured in 2008? Still, there is no indication what the part number change was due to.

If you are having problems with traction control, etc., it may be due to something else. Have you scanned your car for codes?

 

Oops...my bad it's a 2008. I knew that. Can't believe I put 09.
Vin number WDDGF81X18F120282

 

Your car is a 204.081. The thread I posted above has the axle parts diagrams for the 204.081, same as my car.

I think I figured it out after alot of research last night. Im thinking the sensor works off the bearing as brought up above. i look up the front wheel bearing and in the reviews someone said it is magnetic. That and the fact I cannot locate a seperate tone ring at all anywhere for this car leads me to think its in the bearing. Also i came across a tool that is used for seeing which side of the bearing is to be installed at the sensor.






Also found this when looking up that part#.





So now im not sure what the issue is with your wheel locking up. if its the same bearing in there and you didn't mess with the sensor it should work. Maybe something wasnt installed right, or cleaned.

Found this video that has info on the front bearing.

 

Absolutely why the first step is to get the car scanned!

 

Did you see this from the comments in that video? Did you install the axle bolt correctly?

 

Here's how to do it right.

 

Lets start over. I dont think the issue is something missing if you didnt mess with the bearing and steering knuckle.

- What exactly is the car doing? You say the traction control and the abs are not working properly(Post 14), something about the wheel locking up with loss of traction when TCS turns on (Post 1).? When and how often does this happen, in my car the only time I notice the abs warning light turn on is if im on the highway and go over a bridge/bump in the road where the car feels airborne for a split second, it happens so quick, light flashes once or twice.

- Is there a warning light on? I would think if the sensor was not reading properly the light would be on the dash. Do you have a Mercedes specific scanner?

- And what exactly did you do to the car during the repair? More info the better, did you remove the sensor to install the new axle?


I found a photo of what it looks like with the sensor installed in the steering knuckle. Can see how the sensor sticks down well into the gap. Tells me it must work off the bearing. There is no separate abs ring.

 

hi reach out to me on Versace40k@gmail.com