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  #1  
Old 12-01-2009, 11:38 AM
Texholdem
 
Join Date: Mar 2007
Location: Dallas
Posts: 756
High frequency vibration after replacing rotors and sway bar bushings

Hi,

after replacing the front rotors including brake pads and the sway bar bushings I feel a subtle high frequency vibration in the foot well. It is a very light vibration, the kind that tickles you feet very subtly but annoyingly for long distance drive. However the vibration is not felt on the gear shifter. What can be the cause?

Thanks,
texholdem
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1996 E320 since 1/16/08, 171K miles as of Feb 2011

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1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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  #2  
Old 12-01-2009, 01:24 PM
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Do you feel it in the brake pedal?
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  #3  
Old 12-01-2009, 01:38 PM
Texholdem
 
Join Date: Mar 2007
Location: Dallas
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Quote:
Originally Posted by dhjenkins View Post
Do you feel it in the brake pedal?
The vibration on the right foot (gas/brake pedal) is less than on the left foot, which has full contact to the floor.
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1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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  #4  
Old 12-01-2009, 01:44 PM
latief's Avatar
1993 300E 2.8- M104
 
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Location: Gainesville, FL
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He means do you feel the vibration when hitting the brake or while driving (no brakes)?

I think that wheel bearings need adjustment after replacing rotors, but i am not sure of that..
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  #5  
Old 12-01-2009, 02:47 PM
Texholdem
 
Join Date: Mar 2007
Location: Dallas
Posts: 756
when hitting the brake pedal I actually don't feel the vibration because the muscle force applied overtoned the feeling of tickling. On the gas pedal the tickling of the right foot is less than on the left foot.

The vibration seems to spread thru the base plate of the foot well and partly over to the pedals.
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1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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  #6  
Old 12-01-2009, 09:48 PM
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Does it do it out of gear? Does it do it in gear while stopped? What speed ranges does it occur in and does the intensity/frequency of the vibration increase with engine and/or road speed?
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  #7  
Old 12-01-2009, 11:34 PM
Texholdem
 
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Location: Dallas
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the vibration is there both when in and out of gear. it is very light, almost unperceivable and seems not to increase much with speed. Maybe the new rotors need some time to adjust.
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1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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  #8  
Old 12-02-2009, 12:20 AM
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I would suspect wheel bearing.
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  #9  
Old 12-02-2009, 06:30 AM
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Texholdem, were the replacement rotors genuine MB rotors or aftermarket? It's possible one (or both) of the new front rotors is out of balance, or slightly warped. A runout check with a dial indicator will show if the rotors are warped.

Replacing front rotors should not affect the wheel bearings. If the wheel bearings were OK before the recent work they should be the same now.
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  #10  
Old 12-02-2009, 10:46 AM
Texholdem
 
Join Date: Mar 2007
Location: Dallas
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talked to my "indy". He also thinks that the rotors, which are aftermarket parts, are not well-balanced.

Lesson learnt about non-MB parts. Thanks for all inputs!
__________________
1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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  #11  
Old 12-02-2009, 11:06 AM
latief's Avatar
1993 300E 2.8- M104
 
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Quote:
Originally Posted by latief View Post
He means do you feel the vibration when hitting the brake or while driving (no brakes)?

I think that wheel bearings need adjustment after replacing rotors, but i am not sure of that..

Some of the veterans can confirm or deny this ......

But when you change rotors, front wheel bearings will need to be adjusted/ tightened..if not it will vibrate.....I am sure I read this a number of times on this forum the others...

Edit: if Fredman says no, then forget about it, he is one of the experts !!!
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  #12  
Old 12-02-2009, 01:36 PM
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So it only happens while moving, then?
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  #13  
Old 12-02-2009, 02:06 PM
Texholdem
 
Join Date: Mar 2007
Location: Dallas
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Quote:
Originally Posted by dhjenkins View Post
So it only happens while moving, then?
yes, my guess is now narrowed down to the new rotors. Thanks!
__________________
1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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  #14  
Old 12-02-2009, 05:43 PM
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New rotors being warped is nothing new; they should have been checked for run-out...
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  #15  
Old 12-02-2009, 05:58 PM
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You can also rotate yout tires and if there is a change in the feel of the vibration, then it would point to tires being out of balance.
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