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vibration
01-30-2011, 02:00 PM
Post: #1
vibration
mercedes e200,1995,m. drives smooth at all speeds. when over 60 ish,only when breaking,there is a bad vibration.i have checked all the breaks,and had all the wheels balanced,but still the same,could anyone please shed some light ,as i said,its only upon breaking,at speed.
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01-30-2011, 03:08 PM
Post: #2
RE: vibration
Does this car have ABS (Antilock Braking System)? If so, could you be braking hard enough to activate it? You could test this theory by braking hard at a slower speed on a slippery surface to see if you feel a similar vibration.

Let us know.
Thanks, Garner

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01-30-2011, 04:39 PM
Post: #3
RE: vibration
well,you can feel it on the break pedal,but surely the car shouldent vibrate like this,i mean its bad ?
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01-30-2011, 07:48 PM
Post: #4
RE: vibration
Did you test the ABS at a slower speed on snow or a loose gravel surface, 30- 40 MPH? The ABS actually applies and releases the brakes many times per second and it can be felt in the pedal. If it definitely isn't the ABS you have either a bent rotor or drum.

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01-30-2011, 09:40 PM (This post was last modified: 01-30-2011 09:42 PM by Rupe.)
Post: #5
RE: vibration
To clarify what Garner is trying to sort out a "bent" rotor is not something you can see because we are talking about a warp / distortion measured in small amounts. Likely something in the neighborhood of .020" - .050" which is about as thick as 2 or 3 matches held together.

If you have one or more distorted rotors you may also feel a slight head bobbing sensation under moderate braking at speeds under 20 MPH, such as in a parking lot. At 60 MPH this will feel like a nasty shuddering that gets worse as you apply the brakes harder. Typically you feel it in the seat of your pants from the rear brakes and possibly in the steering wheel for the front brakes, but this is not always conclusive.

Another hint: In most cars when the ABS kicks in you can hear a "sprong" kind of sound similar to a broken clock on a cartoon sound track along with an od feel in the brake pedal.

Again, keep us in the loop on what you find as it may help someone else.
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01-31-2011, 01:25 AM
Post: #6
RE: vibration
(01-30-2011 09:40 PM)Rupe Wrote:  To clarify what Garner is trying to sort out a "bent" rotor is not something you can see because we are talking about a warp / distortion measured in small amounts. Likely something in the neighborhood of .020" - .050" which is about as thick as 2 or 3 matches held together.

If you have one or more distorted rotors you may also feel a slight head bobbing sensation under moderate braking at speeds under 20 MPH, such as in a parking lot. At 60 MPH this will feel like a nasty shuddering that gets worse as you apply the brakes harder. Typically you feel it in the seat of your pants from the rear brakes and possibly in the steering wheel for the front brakes, but this is not always conclusive.

Another hint: In most cars when the ABS kicks in you can hear a "sprong" kind of sound similar to a broken clock on a cartoon sound track along with an od feel in the brake pedal.

Again, keep us in the loop on what you find as it may help someone else.




hey rupe just another penny on this subject I once had a chevy lumina that the front end shook really bad and it turned out to be that the belts in the tires were broken and once i replaced the 4 tires the shaking went away
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01-31-2011, 10:33 AM
Post: #7
RE: vibration
Although I wouldn't rule anything out at this point, tires usually present a "vibration" or "wobble" any time the car is moving. I am leaning towards the brakes as he only notices it under hard braking.

Thanks for the extra observation.
Garner

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Garner

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