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4KQ, Suspesion Vibration & Clunk
Car: 1987 4000 CS Quattro with over 100K mi.
Possible Problem Areas: Suspension, Steering, Brakes
* Vibration felt through steering wheel at freeway speeds,
not severe but annoying.
* Clunk noise when straightening wheel after backing out
of a parking space.
* Clunk noise when hitting bumps, speed bumps and driveway
* Some oscillation under hard braking with a clunk in the last
couple of feet before coming to a complete stop.
* Tow angle feels OK, the car does not pull to one side on the
Items checked so far:
The vibration started with an old set of tires. I replaced them
with a new set of Goodyear’s and had the alignment adjusted.
Since then I have had the new tires re-balanced and rotated.
I found some radial play in the steering rack of about 2 to 3
degrees and couldn’t feel any looseness in the ball joints or
tie-rod ends. Not knowing how much play is acceptable
in the rack, I had a “reputable” Audi shop look at it. They
said that everything was tight and that the control arm bushing
where OK. They didn’t feel much on the test drive. I was not
overly impressed with their evaluation; they failed to inspect the
brake rotors as requested.
Work done in this area in the past includes new outer CV joint
on the left, new rotors and non-metallic pads, H&R springs,
Boge T-gas cartridges, and new strut bearings all about two to
three years ago. Brake pressure proportioning valve was
replaced about a year ago.
* Is the play in the rack normal, how much is acceptable?
* Could warped rotors cause vibration at freeway speeds?
* Is it possible that there are two problems here?
* If a new set of rotors warps quickly are there other brake
parts that may need replacing?
* Are there other components that I should be looking at?
Thanks in advance for your input,