A question was asked about the ABS switch on the dash pad of the K1. I've never owned a K1, but assume it's the same as was used on the K100s and K1100s. In that case, the switch DOES NOT turn off the ABS system. Word is the lawyers would not allow that.
When ABS defaults, or doesn't engage on take off, the ABS lights in the instrument pod will flash in warning. All that the switch does is stop the flashing. It has no effect on the functioning of the ABS itself. From memory, I believe one of the ABS lights stays lit. After some time/distance, the lights return to flashing mode.
It appears that with this Gen 1 ABS system, BMW was planning for a fair amount of defaults.