also look for fluid coming from this inching valve
there is weep hole in side of valve, if you have wetness around valve weep hole then it is leaking and should be resealed or replaced.
do the same for inching master cylinder, pull back boot at rod and see if fluid is present inside boot, if fluid wetness then master is leaking and should be resealed or master replaced.

and yes also check rod freeplay, as was stated, 1/8 inch freeplay at rod or 1/4 to 1/2 inch freeplay on pedal before rod touches piston.