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      08-12-2019, 09:49 AM   #35
weavingtraffic
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Drives: slow
Join Date: Feb 2010
Location: CT

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2009 BMW M3  [10.00]
1990 Mazda Miata  [0.00]
1985 BMW 325e  [0.00]
Quote:
Originally Posted by Encanto View Post
The GTS uses the iron rotor booster with CCB rotors and its own particular coding OEM, the only model that uses that combination from factory. Any other model with CCB requires the iron rotor booster retrofitted when swapping CCB rotors with M2C iron rotors and coding.
I've been seeing you post this plenty. In quite a few threads. And haven't come across this to be true in any of my research. Not saying you're wrong because what do I know, but I am calling you out to provide a source for this information.

Here is an interesting post I have come across while searching the forums.

Quote:
You are basically swapping the original blue 4/2 pot to gold 6/4 pot calipers just like upgrading to other aftermarket brake kits. In other words, it shall not relate to CCB system.

For your information, here is the piston size and front/rear area ratio:

CCB (gold) brake calipers:
Front 6 pistons: 30/34/36mm = 52.7 cm^2 (68%)
Rear 4 pistons: 28/28mm = 24.6 cm^2 (32%)
Total: 77.4 cm^2
Iron (blue) brake calipers:
Front 4 pistons: 40/40mm = 50.3 cm^2 (67%)
Rear 2 pisotns: 40mm cm = 25.1 cm^2 (33%)
Total: 75.4 cm^2

Total piston area and F/R ratio are almost identical on both set up, so we see no reason to be even concerned on brake bias due to this upgrade, while it might be worthwhile for you to check aftermarket brake kits that you are considering before you purchase.
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