Do you know the part number for the washer (if it exists)? I have not looked at the RM precedure for setting the preload for the 126, used the 123 info that I remembered. Maybe that's my mistake. I'll look into your posts.

The hubs were cleaned thuroughly before I pressed in the new bearings so I don't think that there was dirt or dibris on them that is causing the vibration. The rotors installed were clean and new (Zimmermann cross drilled) and could not have added much to the tolerance. But I'll check runout to see if there is any indication that the rotor is not seated right onto the hub. I'd doubt this because the symptom is the same now that it was with the old rotors.

Could the brake reaction rod bushings cause a vibration when brakeing consistently and with even pressure?

ATLD