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Originally Posted by 97 SL320
Generally pad material transfer to the rotor is desirable, it increases the friction coefficient and is partly why new brakes on fresh rotors don't work so well at first.
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I didn't know that. And I have an ASE brake cert. Learn something new every day 
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If there are outlines of the brake pad around the rotor, this is sign of repeated hard brake use then sitting stationary for a period of time. ( running road course time trails, coming off the track hot then parking the car.) This might cause noise but usually results in thumping when the brakes are applied.
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I've seen those outlines before. I thought that might be the cause.
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Sometimes the caliper does not have enough mass damping and will squeak no matter what you do. I've read that on the R129 bodied SL600 aluminum calipers were prone to noise at more than 1/2 pad wear, moving to steel calipers added more mass and took the system out of resonance. It might be worth looking for a service bulletin.
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Interesting. I'd be less interested in adding unsprung weight, but also curious how well aluminum calipers stand up to heat over time. Come to think of it, the calipers on my bike are probably aluminum, but that's with large dual front rotors, plenty of air flow, and only about 600 lbs of combined bike and rider to slow down.
Good post! 
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.
83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.
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