Wighty
Senior Member
- Joined
- Aug 4, 2016
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- 13,500
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- Location
- Sunny Essex
- Your Mercedes
- W211/E320cdi/2009 and CLK200k 2009
Could any movement in bushes or arms that connect to the back of the hub cause this ?
That’s a good point palI think the fact he can make the problem disappear for a while pal , suggests it cant be anything but brakes related , no ?
Have you checked the discs for runout ? With a dial gauge
Hey Jimbo - How are you getting on? Took my car in today to have it checked over as the judder is just so annoying ...
Mechanic has asked if the car had any serious bangs i.e. potholes ... I said no however, the misses chipped up and said oh I did hit one the other day and it made a bit of a bang ...
Anyway, mechanic looked it over and said everything seemed OK i.e alloys and discs. He said that he had a previous situation where the Wheel bearing or actual HUB were damaged as a result of the pothole. He thinks this is a similar situation based on his observations. Car is going in for some more stringent tests i.e. run-out on disc etc.
Have you tried the wheel bearings or hubs? It doesn't take a lot for the balls in the bearing to scar the roller edges (due to the large amount of force from a pothole).
I've also read a bit more online where people similar to yourself have replaced discs/pads many times ... to conclude in the end that every time they put a new disc on ... they're putting it on a warped hub hence after 500 miles ... the problem would return.
Just some ideas for thought ... they may be absolute tosh! Will let you know how my e-class gets on however, I know your coupe has low profile alloys ... a pot holes favourite!
BR
Jan
Thanks Jan, this seems a good possiblity, I've also noticed that there is an almost burnt line (black sooty looking) in the paint of the hub section of the new front discs, which have only been on the car for approx, 400-500 miles, plus I've had to get one wheel re jigged and straightened out after a hard hit on a pothole.
A technician I had asked for a second opinion reported that, in his opinion, the wheel bearings were a little loose and that would cause potential overheating on the hub section, but, that shouldn't cause the issues I have been experiencing.
However after reading your report I suspect that you might be onto something there, plus, I might be experiencing the same issue so, I will be following your feedback with interest.
I need to get to the bottom of this soon, it's driving me round the bend. So much so, that I actually seriously looked at buying a different car today, I just couldn't go through with it though as, when I viewed both cars together today, mine looked so much better despite being a couple of years older and it was better equiped too.
I discovered I will be keeping my Coupé, but, for my own sanity, I need to get to the bottom of this.
If the tech said that the wheel bearings are a little loose - this can cause the judder. When the brakes are applied, it is causing a lever effect on the axle hence the constant judder.
I would attempt the following
1. Dial gauge for disc run out
2. Hold the Axle housing and spin the wheel - can you feel any vibrations?
In my case - if my alloy isn’t buckled and the tyre didn’t blow - something has got to absorb that pothole smack from a horizontal force point of view...
I suspect that we are on the right track here Jan, I can suggest that these checks are done prior to the fitment of the new wheel bearings to obtain confirmation of our suspicions.
However, I feel I don't need the dial guage to confirm what I already know, the discs are warped. I can feel it through the seat of my pants and through the steering wheel, there is a roughness present that there should not be on a Mercedes. They are generally one of the smoothest driving cars I have ever experienced.
I had not driven my car for almost a week when I drove it today, on the new by-pass built around the town I live in, which, I might add is wonderfully smooth when driven in every other vehicle owned by my family (4 cars in total), plus my works vehicle. Today when I accelerated up the by pass road I could feel the roughness through the steering wheel, in fact the more I think about this the more I am convinced we are definitely on the right track.
Please let me know how you get on and I will also update you on my progress.
I had something similar on my Vito turned out to be a slight flat spot (very hard to spot) on the alloy prob from a pothole. First I got the wheels balanced then new tyres and no difference. Fitted another set of alloys after fitter mentioned flat spot when new front tyres were being fitted and steering shake was gone. Only cant figure out why your shudder was intermittent or disappeared for a while?
£10 on eBay , or easy job for your local garage ?Nope, I don't have a dial guage sadly.
I had something similar on my Vito turned out to be a slight flat spot (very hard to spot) on the alloy prob from a pothole. First I got the wheels balanced then new tyres and no difference. Fitted another set of alloys after fitter mentioned flat spot when new front tyres were being fitted and steering shake was gone. Only cant figure out why your shudder was intermittent or disappeared for a while?
Was the wheel shuddering during driving and no braking? If it goes away and then comes back like the OP suggests with new discs/pads - then it has be something to do with brakes ie the incorrect geometric setup (hubs, bearing, suspension). Interested to find out from the report of the tests!
The previous owner for my e class has fitted a new set of Run flats (I understand them - but don’t like them) so the force the alloy wheel/bearings/suspenion/hub must of absorbed would be insane.
Your correct Jan Van Der Lubbe, sorry if I confused the issue for the OP, I didn't have any issues under braking just on acceleration and steady speeds over 50mph. Next time I will read the OP posts more carefully. I would have to agree with you on discs or a suspension/joints problem, again interesting to see the outcome of this
It's ok Kev I understood what you were trying to get across and that it was not relevant to my issues other than a slight association in vibration so, no worries.
I suspect that my wheel bearings are the issue and are allowing excessive movement of the hub/disc assembly so as soon as I get them replaced I will update everyone with the pertinent information.
Hey Jimbo - I’ve got a Mercedes virtual machine running on my PC. If you need - you can send over you VIN and I’ll get all the documentation / part numbers / diagnostic guides / repair guides for your car