It is via the ABS unit in both 'directions' like Max says - that's why you notice this: What I noticed is that "dead spot" disappears if I'm applying the front brakes. It is only noticeable when I want to rear brake only.
https://www.kawasaki.ca/media/mig/2012/concours-14-abs/English/files/assets/downloads/page0007.pdf
I meant as far as bleeding it goes. I tried pulling the lever in while bleeding the rear, the lever didn't budge. I know that air sometimes gets trapped behind the pistons in the caliper and doesn't come out, especially since this is a hanging caliper. I'm going to push the rear brake pistons in today, forcing any air out. If that doesn't work, I'll adjust the pedal lower so the dead spot is gone, making sure I"m not constantly braking.
There's a good chance what I'm experiencing is spongy brakes until the front kicks in as well. I just went outside and checked it out and I'm pretty sure it's spongy. Going to get all that air out today. Tell me if I'm doing the bleeding wrong.
* Check to see fluid level is above "Low". Refill if necessary.
* Pump the rear brake pedal a couple times and keep it pushed down
* Open the bleeder valve for a second and close it
* Observe fluid moving out
* Repeat