Brake rotors are rarely perfectly flat or centered. "runout" is the Word used to describe how far from perfect a rotor is.
use a dial indicator
With a dial indicator.
if you are measur any diameter then in a specific place difference in diameter it is run out but, if the deviation in diameter is along the length then it is total run out
A dial indicator.
sachin
He can only be out on a no-ball when it is a runout
.002 per foot of shaft
how many runout gets in cricket by yuvraj
neverrunoutofshots
A measure of eccentricity of a shaft or bore usually measured by a dial indicator
Rotors may be out of "round" (lateral runout) and need to be resurfaced or replaced