If you are sure all the air is out of the system it also could be the bolt in between the master and the booster.
You may need to adjust the length.
The way I did mine was on a driveway with a small incline.
I ran the bolt out until the brakes were dragging, which you can tell by putting the Jeep in Neutral and letting it roll.
Then keep adusting it untill the Jeep rolls without any resistance.
93 YJ SOA 2" springs front, XJ springs rear w/main leaf added, High pinon 9 inch rear detroit locker front Dana 44 ARB 4.56 Gears, 36 inch Irok tires too much to list.
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