New brake rotor runout
New brake rotor runout
(OP)
When installing new oe-spec front brake rotors, and the disc retaining screws are properly torqued, is it necessary to check the runout? If so, is the integrity of the hub what we are assessing?





RE: New brake rotor runout
Certainly the factory doesn't check run-out after assembly.
Does the workshop manual actually specify that you do this? I suspect that if it does then it is making sure that you have actually cured the fundamental problem.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: New brake rotor runout
RE: New brake rotor runout
Rod
RE: New brake rotor runout
Sorry, Greg. I did not see this thread until this morning. Isn't it SOP to have the occasional quality control check?
Perhaps it's because the "QC" folks were on coffee break when my Canadian built '95 Chrysler LHS came through with the 'totally out of spec' brake rotors. Thanks to a good warranty, all four were replaced by <6000 miles. FWIW, the OE discs on our '01 Lincoln are still doing fine at 130,000 miles.
Rod
RE: New brake rotor runout
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: New brake rotor runout
For example. it is not uncommon for deliverymen to drop rotors from waist height to the ground to save their backs, or for them to store or ship rotors on end. Yes, this is a human problem, not an engineering one.
RE: New brake rotor runout
Excessive clearance proved to be excessive wheel/rotor runout, and the same (otherwise acceptable) dealer had done wheel bearings about 6 months before. Further inspection on Satruday morning with everything still assembled revealed a huge hammer dent on the hub OD that raised a big (0.010 inch)lump on the hub face, which tipped the rotor and wheel. It seemed quite likely that the dent was an artifact of the wheel bearing replacement.
Within the first 100 miles after the bearing change one wheel's lug nuts were loose, and now I'm thinking that was the lump wearing down a bit.