I was trying to measure run out on my brake discs to see if I need to replace or shim them and I kept getting wild all over the place readings as I turned the axle. All four lug nuts where snuggly in place, and the brake pads had already been removed. The first thing I have to say is I'm not sure if I'm reading the dial caliper correctly.
I set my dial meter to about zero:
Then I pushed on the disk with my thumb and the dial indicator moved left about 0.16mm:
Then I pulled on it and the dial moved to the right about 0.42mm:
So I've got about 0.59mm play in the brake disk. Run out is supposed to be a max of 0.07mm, and axial end play on the front wheel bearing is supposed to be 0.05mm. Do I have bad wheel bearings ( they were actually a bit hard to rotate ) or could this be something else?