I recently put full size axles under my cj5.
Dana 44 disc chevy front, dana drum ford 70 rear (dually). I have also installed steel braided brake lines in front.

I am running the stock 1978 manual cj5 master brake cylinder, and am running into some problems.

I've blead the entire system, but still get a "guiser" effect after releasing the brake peadel, mainly the front disc resorvoir? I have great preasure in lines, but when the brake pedal is all the way releaeed, all presure is lost.

I did replace the proportional valve, and have blead brakes more then I have ever blead.
I have beanch blead, valve blead, ect., ect.
looking for help, thanks,