So a rotor made from an iron with lots of impurities, a non-homogeneous/incomplete blend will be just as good as a rotor made from a properly created "good" iron?

Yes, if there is a mistake in the metallic make-up of something it is more than likely the foundry's fault, however the result of that screw-up will show up in the molecular structure/composition of the end product. Blaming the foundry vs. blaming the metallurgy is semantics when it comes to the end user.

For example, I have a pasta sauce that is too salty to eat. It is too salty because it has too much salt in it. The fact that I'm the one that put too much salt in it doesn't take anything away from the fact that it has too much salt in it - the end result is that it has too much salt in it. Who put too much salt in it is irrelevant when it comes to the saltiness.

Further more, iron rotors are hardened during the casting process by controlling the rate of cooling. If you cool them too quickly, they'll be harder and more brittle. If you cool them too slowly, they'll be softer.

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.

Years ago, Rotors and drums used to average $80-$90, sometimes more, each at the local parts store or dealership. They were produced in the respective Country the vehicle was atleast produced in and either met, or exceeded factory quality units. Lots of people used to have their old ones cut & resurfaced, because that would cost about $10-$15 per. They were made of such good quality that you could do this once or twice before tossing them out.

Now, they can be had for as little as $10-$20 each, for almost any vehicle, from a local parts store. This is due to the fact that now, they are made in China, in places where they throw a chunk of the cheapest piece of metal they can get,into a computerized machine. An hour or three later, this machine spits out a whole bunch of rotors or drums. These rotors and drums just barely meet factory spec and standard, if they even do at all. Cuttin/Resurfacing them is not an option when your brakes are worn, because they end up with such a bad lip or wear mark on them that you can't cut enough off to get rid of it. They often come out of the box warped, or warp very shortly after install. Again, due to the poor quality & workmanship invested into them initially.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

Ikchris,

So,whose the OE supplier to Stuttgart?

[Trick question: is there any Superior Quality Rotor,offered?]

(You guys do realize Kestas is a Forensic Automotive Metallurgist ?]

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'84 300SD sold
124.128