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#1
12-01-2009, 11:38 AM
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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 --------------------------------------------------------- 1989 300CE - R.I.P. Dec 29 2007 Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE 
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#3
12-01-2009, 01:38 PM
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Quote:
__________________
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
12-01-2009, 01:44 PM
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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..
__________________
1993 300E, 2.8 M104 .....
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#5
12-01-2009, 02:47 PM
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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.
__________________
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
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?
__________________
A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608 Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL. 
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#7
12-01-2009, 11:34 PM
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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.
__________________
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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#9
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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Fred Hoelzle
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#10
12-02-2009, 10:46 AM
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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
12-02-2009, 11:06 AM
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Quote:
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 !!!
__________________
1993 300E, 2.8 M104 .....
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#13
12-02-2009, 02:06 PM
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Quote:
__________________
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
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...
__________________
A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608 Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.
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#15
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.
__________________
D.H. 04 ML500 02 E430 Experience is something you don't get until just after you need it.
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