does this type of repair

I replaced my master and slave cylinder three days ago and it didn't come with a new line so I just used the old one. I let it sit for 24 hours to try and get the air out but its still not completely bled and I'm not getting good pressure. what should I do now?

I have a restored 1993 W250 4x4 and ordered some air bags for the rear that turned out to be wrong. The air bags were for a "4 inch lift" which the truck appears to have... But I'm told it's simply a stock height for a 4x4. I'm now told the part number is 2071 (Firestone air bags). Can someone shed some light on this?