in conclusion did you buy another ABS or do you still drive around with ABS removed? Just asking.I went thru this same problem a few months ago.
One wet morning on my first brake the ABS kicked in, next stop had pedal almost to the floor.
It would stop but almost to the floor.
Replaced the 23yr. old M/C, same thing. I overhauled the H/B about 2 years ago and it was working fine.
What's left? ABS unit. Researched and found out they can fail like that. Removed it, better brakes than ever.
I do not recommend doing that for obvious reasons.