K1200r abs faults

[Cliff k1200r]

Hi all , I have been having problems with abs 111 pump on k1200r 2005 . I have now narrowed it down to faulty sensor on front wheel control circuit using my friends gs911 (which is great to use by the way) and faulty rear brake switch . I have had the abs completely apart and cleaned motor bushes on servos , cleaned all the filters , refilled the whole system with new fluid using correct procedure .
Is there any way of replacing the faulty sensor ? Or both if I take it apart again ?
Or is it just as well to do away with the servo and abs system with the kit from motor works and put up with the flashing light ?
Thanks