13 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
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Discussion summary
YOUR RESEARCHC4s Steering Wheel Vibration
Reported or suspected cause
3 years ago
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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Reported cause · Original poster
Last time I ran into this problem was 3 years ago on an X5.
Leading evidence: '3 years ago' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is '3 years ago' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check first' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
Last time I ran into this problem was 3 years ago on an X5.
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Suggestion
As Viken suggested, check first with the dealer to see if they will cover it under warranty.
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Suggestion
You might want to consider having the front rotors checked for warping.
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13 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Outcome without a verified action link
I don't think it is my t-pressure b/c the car was just at the dealer for the right pull (which is still not fixed by the way).
If I am driving down the highway in the 90mph range, when I put on the brakes to slow down (gently) the steering wheel seems to vibrate as I pass through 75mph.
Normal? Any thoughts on what this could be?
Last time I ran into this problem was 3 years ago on an X5. Apparently the tire pressure was wrong.
I don't think it is my t-pressure b/c the car was just at the dealer for the right pull (which is still not fixed by the way).
03 C4s
How about getting all pending problems fixed to see if the vibration goes away. Also, don't rely on the dealer for tire pressures, check them yourself. If the vibration is strictly during braking, it is very likely that you have warped rotors as wbgordon suggested.
I'd take the car to the local Porsche dealer or a shop that specializes in Porsches. If the rotor(s) is warped, it will have to be replaced. If so I would request OEM parts only. Cost is about $600.00 per set of two, including brake pads.
A rotor can warp anytime, anywhere, commonly after you drive the wheel through a puddle of water after getting the rotor hot from braking. The sudden change in temperature causes the metal to warp. As Viken suggested, check first with the dealer to see if they will cover it under warranty. A rotor is a wear item, meaning usually it is NOT covered under a warranty, but since this happened to you at such a low mileage, it might be looked at differently.
For a more complete education, see the attached. Rotors rarely "warp"
http://www.stoptech.com/whitepapers/...otors_myth.htm
If you are getting "pounding" when you brake as opposed to a vibration at only a certain speed, then it is likely that you have transferred some brake pad material onto the rotors. For a porsche used in normal driving conditions, especially with your limited milage this is unlikely, but it does happen. Audi has had this problem, at least they had it on the 2000 MY cars.
Porsche brakes need to be scrubbed off a bit after they sit for a while, but this scrubbing off is only a brief process of a couple of brake applications over a distance of 50 yards or so.
If you are experiencing this vibration at only a certain narrow speed range say between 60 and 70 miles per hour, AND you experience it ONLY during braking, then it is gotta be brake related. If you have transferred brake pad material to the rotors, you can tell by looking at the rotors, but you have to know what you are looking for as the difference this causes in rotor thickness is barely measurable. Look for the outline of the brake pad "tatooed" on to the rotor. The article I attached tells you all you ever want to know on the subject....
Good luck
Thank you for your help. The article is very helpful. I will drive the car again today to try an narrow down the speed at which the vibration occurs. Could be some excess pad material on the rotors though.
Thanks again !
This is a source reference. Confirm exact model applicability in the original material.
