Let it sit a day or so.
Then watch the fluid in master cylinder while slowly depressing the pedal.
Are bubbles comimg up? Do it a few times to see it it improves. I dont think your sucking air, but the cylinder may have gone bad. It happens...

After many years of replacing calipers and cylinders, i have had best results by gravity bleeding 1st before using the 2 person method.
Steady even pumps work best..at least thats what the girl friend says