Are you using stock master cylinder?
Yeah, well at lest I believe so. My XJ had a disc brake Ford 8.8 and a HP30 in it when I bought it. So it could have been swapped to a ZJ or something. It had a bunch of work done to it by someone. Not the guy I bought it from though, he just thrashed it. The brakes work pretty well though but I may swap in a 2500 Ram Van master cylinder eventually.