The ABS has a grey out (Stops fuctioning) at 10Vdc. When you have a flat or old battery the battery voltage will go below 10V when the starter motor runs.
There is a modification on the internet where you re-route the power for the ABS unit via the starter relais. The ABS is only powered if the starter motor is not running.
Just Google for "modification abs r1100".
succes
The abs computer should reset its self when you put on a new battery but it could take a fuw miles of driving to do it, good luck on this one
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