Quote:
Originally Posted by BAN SUVS
No direction. Or all directions. It's for tiny amplitude vibration. Smaller than the range of movement provided by the hardness of the rubber in the damper. Remember, "damper" doesn't mean "strut/shock absorber." In other words, it's for the vibrations created by the friction of the pad/rotor contact under braking.
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Looking at the photo I'd guess the "damping" is directional, but I can't tell which direction.
A tuned-mass damper actually uses no "damping" in the traditional sense. It is simply a mass on a spring with no or minimal damping of the spring. You tune the resonant frequency of the mass/spring combo to be equal to the frequency of the vibration you want to damp. A small amount of mass can do a surprising amount of damping in this configuration. The theory is that at resonance the mass tries to vibrate to infinity (and beyond!). It obviously can't do that due to various real-world constraints, but it can counteract a lot of mass vibration, so don't assume it is just for micro-amplitude damping.
Having said all that it wouldn't surprise me if it was for nothing more than reducing brake pad squeel or something mundane like that.