Capt Fathom,
While certainly not desirable, Mr Boeing has MEL 32-2 for the B738 which states ,in part, relating to the Anti-skid system "Number Installed 1", "Number required for dispatch 0" (except for 30 metre wide runways). In other words it can be U/S !!!
It requires some pretty hefty performance limitations but I'm sure QF is not "the only operator that does that in a jet".
