Ok: This is a control arm bushing for an example. That's a metal tube on the inside and outside insulated by rubber. These are like bearing but only use the flex of the rubber instead of a greased joint/shaft etc., used front and rear in cars to struts and control arms. Items the bear full loads and need to twist or turn more are usuall ball socketed joints with grease in them.
These rubber ends shine up againt the metal where they are mounted and make the sound you describe. You may notice they can be quiet when it's raining out! You may notice when you just open the door and sit down the let you know they love you
If they are really worn and need replacement they usually will give you a clunk or metalic squeak and must be replaced. There are rubber things like this in suspension, shocks, MacPhearson struts at top, sway bars front and rear. Even leaf springs use this type things at the mounted ends.
So: Some make noise, some don't. I spray WD-40 by brand and follow up with white lithium grease which will last for ages if you can get it right where it belongs. They aren't all making noise - usually just one and perhaps the matching one on opposite side. With one person jouncing the car another tires to locate where and spray away - ah ha! When it stops you can nail that one with the spray lithium grease too and problem is over.
Some rubbery plastic body/bumper parts are held snug with springs or clips and they have enough movement with just minimal body torque to make noise also. Check for all. Some may need periodic attention and real worn parts should be fixed.
Hope that helped explain it an the cure for that if it is exactly that,
T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/
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