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      01-04-2015, 05:06 AM   #1
Mortis
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What are the rotor hubs made of?

I've heard that the brake rotor hubs in the M3/M4 are made of aluminum. Can anyone confirm or correct ? Thanks in advance !
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      01-04-2015, 10:06 AM   #2
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Correct. The brake hubs are made of aluminum. Was the same on previous gen M3s.

Quote:
M compound brakes have a grey-cast friction ring in a floating arrangement that is connected by pins to the aluminium brake cover. The pin assembly means that as the temperature increases, it is able to expand freely in a radial direction and subsequently cool down again without any residual deformation.
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Last edited by CanAutM3; 01-04-2015 at 10:12 AM..
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      01-04-2015, 09:16 PM   #3
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Originally Posted by CanAutM3 View Post
Correct. The brake hubs are made of aluminum. Was the same on previous gen M3s.
Many thanks!
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