I used my tektro kit on my tektro brakes today and there was one odd behavior.

When pulling the syringe plunger back out to pull oil back toward the caliper, I got a bunch of pretty much endless bubbles coming out of the slave cylinder body. Some oil too but way too many bubbles.

New bleed kit. Installed and operated according to spec, but it's like air is coming into the cylinder body around the nozzle threads at the syringe. Plunging in works fine (after the oil settles).

I only had the nozzle bolt open 1/4 turn - it was enough for oil to flow thru. The video online showed the guy pushing and pulling the oil thru the system at will. I get these bubbles.

Anyone see this before?