The "theory" (as I understand it) for the uneven pad deposition based brake judder is that a little "hill" of as little as
15 microns (according to one of the papers we listed) will cause low frequency (around 100 Hz) brake judder.I'm still trying to figure this out, but apparently two things happen at the same time when the pads hit the deposition "hill".
- The pads "push back" causing the vibration to be felt in the brake pedal.
- The force varies, causing the entire suspension to shudder.
At least that's how I understand it after reading the (complex) papers a few times. I'm still reading them though, so consider this a preliminary explanation.