I vaguely remember reading somewhere that cast iron discs need to be “weathered” before fitting. If subjected to heat cycles prior to this, they can warp.
If my memory is working OK (it doesn’t always!), could be that skimming on the car is done after the discs have had several heat cycles and they warp no more.
To this end, when I had new discs fitted to my 4/4 in October 2022, I resolved to be very gentle with the brakes for a while. 12 months later, they have yet to warp. It would be lovely to think that I have a fix!
Can any metallurgists confirm or ridicule my hypothesis?
Paul, in short yes
