Two weeks ago problems with brake vibrations started. Since than, everything was ok, Fanaleds was not updated meanwhile and I'm running latest version. Though iRacing had couple of patches and hotfixes.
I have enabled brake vibration on wheel lock detection, sensitivity 90-95 (tried both thresholds).
Now when wheel lock is detected, vibration in pedal sometimes last several seconds even one minute, which is like half of one lap.
For now I had to turn off this nice feature, as you can't race when your pedals are vibrating almost constantly.
Related iRacing forum topic: http://members.iracing.com/jforum/posts ... 90181.page