i have a 1995 Suburban and had to replace the rusted rear brake lines. I have bled the lines till no more bubbles were present and used a standard sequence of RR-LR-RF-LF. I still have a very low squishy pedal.
I did find a recent post on a newer Suburban regarding the sequence as LR-RR-LF-RF
Which sequence do i use or should i be doing something else?

 

i had the same issue with mine. I had bled brakes a million times in my life and never could get mine to get tight. my dad has a little hand held vaccum pump that was about 20 dollars and he said lets pull fluid with that. I was thinking it would be a waste of time as i know i know how to bleed brakes. Well sure enough we pulled about half a bottle of fluid thru the lines and when we were done, problem solved. i dont understand why but it was. The only thing i can think is that were was a bubble way up in the line that i just didnt get or something. Anyway maybe give on of those a try. they are also very nice because you dont get fluid anywhere.