2001 Chevy Blazer No pedal after rear pad/ caliper/ hose re

Greetings, My rear pads were worn, after pad replacement, the right rear brake would not release. I replaced both rear calipers, and both rear outer hoses. Bled the brakes, (all 4 wheels), but the brake pedal goes right to the floor - with the engine running. With the engine off, the pedal is fine. I am starting the think the Kelsey-Hayes module is defective....and why does the Kelsey-Hayes module have 5 fluid lines?

Thanks in advance for your assistance!

Mike