(01-21-2018 02:42 PM)2017EX Wrote: It would be interesting to know exactly why the manual says to replace them. I imagine replacing the bolts would not be cost prohibitively expensive, particularly for a safety item. That said, I replaced my bar ends, and the manual said to replace the mounting screws. Since the bar end screws are not under a lot of torque, and consequently not subject to fatigue, the only reason I could think of to replace them was that new ones have a fresh thread locking patch on them from the factory. I did not replace the bar end screws because they were perfect, and simply used some blue thread locker. So, perhaps this is the same situation with the rotor bolts?
They are a single-use bolt which stretches a predetermined amount. Once used and removed, the bolt is considered unsuitable to put back in service.
I've replaced a bunch of these. I think I still have quite a few left over.
It'll cost about $20 to replace them, cheap insurance. Honda says to do it, I do it.
You COULD replace the bolt with a conventional, non-stretching type of the proper grade and size, but I figure Honda have a reason for using that particular bolt and when it comes to brakes, I don't like guessing.
Bar end weights, if they come loose, not likely to lead to a crash.
Brake calipers, probably.