Originally Posted By: gregk24
What does this mean? I am at the shop getting tires installed, I mentioned that my rotors shake when stopping from highway speeds. The owner checked run out and said it wasn't all that bad and he was surprised that I felt anything at all. He then mentioned that it has floating rotors common to Honda, Acura, Mercedes etc. and that the should be torqued by hand to the proper spec. What does this mean exactly?
He incorrectly named the part. Back in the day it was common for rotors to have the bearing installed in them along with the wheel studs, those you had to very careful torquing the wheel you could flex the rotor.
The rotor used on your car are just hats, they fit over a hub which either contains the bearing or is a stub shaft that goes into a cartridge bearing as on the front of your Honda.
Full floating as someone posted are held by buttons to the part that goes on the wheel in the case of a MC or a hub.
Before checking run out you must clean the hub face, rust can form and throw the run out off. If he didn't do this first the whole exercise was meaningless.
If the run out is slightly off just rotating the rotor on the hub may correct it when installing new rotors if not shims are available.
You possibly have uneven pad deposits on the rotor, do a few hard controlled stops from 60 mph, give it a min to cool down before repeating.
To halp prevent this, after hard braking coming off the highway for example don't sit there at the stop sign very long with your foot on the brake, use the e brake instead once stopped just keep light pedal pressure to keep the brake lights on but not apply pressure to the pads.