2002 Silverado No brakes after replacing leaking lines and master cylinder

[bighank]

Had leaks from brake lines from master cylinder and ABS and also 3 front brake lines from the ABS. Replaced them and then replaced master cylinder.
Bench bled master cylinder and then attached to the lines to the ABS. Did normal brake bleed, R rear, L rear, R front, L front. Pedal seemed spongy.
Started truck and put it in gear. WOW NO BRAKES!!! Pedal goes down to the floor. Removed brake lines from the master cylinder and reattached clear plastic hoses to fittings on the master cylinder. Re-bled the master cylinder until only brake fluid shows in the plastic lines - no air.
Have heard that the ABS unit can wind up with air in it. Very possible as had to connect 4 lines to it and they obviously had air in them.
Do not have a scan tool. How can I purge all of the air out of the system? What else could cause the NO BRAKE condition and how can I fix it?

 

[Saddle Tramp]

Hopefully one of these will help.

 

[bisontonneaucovers]

Sounds like air’s still trapped in the ABS unit — really common on these trucks after line or master swap. You’ll need a scan tool with an ABS bleed function to clear it properly. Without that, try a pressure or gravity bleed, drive to activate ABS, then re-bleed all four wheels.