Rotor replacement

Thanks,

hemi71x said

If your really, really, concerned about rotor run out, mount a dial indicator on them when you get done, as CFD244 suggested in reply 48.
You think the factory rotor assembly line ever put a dial indicator to these things when they put them together.
Of course not.
Then there were untold disc brake cars out there from new, running around the streets, without any run out issues.

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Thanks, I appreciate the knowledge. I'm just trying to gather as much info as I can before I start, plus I love learning about this stuff. Here's why I was asking about runout. I have a good friend who's a retired mechanic and he said I'd probably have to turn the new rotors after I mounted them to the hub because they weren't born together. At first I doubted him but then I read in the manual that if you need to replace the rotors they should be replaced as a unit with the hub. The manual also says that if you have to separate the rotor from the hub to replace a damaged stud you should first place an alignment mark on both and so that when you reassemble them the marks should line up so that they stay in "balance"(their word). So it seemed to me that the rotor/hub assemblies were coming to the Line (and parts dept.) preassembled and balanced from the supplier. Since it seems that no-one has had any issues with runout or balance so I'll just change them and re-mount them and see how it goes.