What are "compound brakes"?

What is meant by "compound brakes"? (as in the compound brakes on the M3 competition package) I looked all over google and couldn't find it defined
anywhere other then a veiled reference to different pad material (ie ceramic or carbon fiber). Thanks.
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it is the same as tyres. more grip they have less they can last BUT more grip they have!!!
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Nobody wrote:

They're in more than one part.
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snipped-for-privacy@yahoo.co.uk wrote:

The rotors that is, when compared to the more usual BMW items
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