In reply to accordionfolder:
Well, at least the topic was still brake rotors!
In reply to accordionfolder:
Well, at least the topic was still brake rotors!
wbjones wrote: good read from Stop Tech about the myth of warped rotors: http://www.stoptech.com/technical-support/technical-white-papers/-warped-brake-disc-and-other-myths
That was an interesting read, but there were a few point that I'm skeptical about.
For example, the damage shown in this image may not technically be "warped", but it is unrepairable damage related to heat none the less. I'd be OK calling that warped.
Isn't there a forum member here that is an OEM brake system designer/engineer? It might be Angry Corvair?
Anyway , there was an article published in GRM a few years ago about brake systems. IIRC, that article indicated that in most circumstances blanks were best for performance use due to the fact that they heated more evenly and had fewer stress points. They also have more mass of iron which equals more heat sink capability.
Speaking of mass of iron and heat sink capability, this is where many of the cheap Chinese rotors fall short. I also suspect that their materials and casting process may be inferior too.
And its not always the Chinese rotors that have problems, I had a pair of Zimmerman rotors on my SAAB c900 that were nothing but problems. I machined them twice, there was no convincing evidence that they were warped, but they never stopped smoothly. The NAPA premium rotors were great from day one though.
In reply to HappyAndy:
That diagram text reads "pad induced distortion" (of the rotor itself). Sounds warped to me!
In reply to HappyAndy:
According to several posts (and the distributor box from a Napa employee) some Napa gold rotors are just brembo blanks, I'll find the thread when I have a chance.
My understanding that another cause of "warped" rotors is changes to the meturlagy of a rotor that has been over heated. It doesn't actually deform and bend. The rotor gets hot spots that change the hardness in some areas related to others, like heat treating. It's not uniform, so the surface wears at different rates, leading to a "warped" surface. That's why the problem often returns after a rotor is turned. The surface is trued, but the hardness still varies. As it wears again, the high and low spots return.
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