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      02-27-2019, 02:03 AM   #128
Bluer2
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Quote:
Originally Posted by Encanto View Post
The rotors are different in diameter, thickness and more significant, the radius of the hat. That is what you see when the 4-piston caliper is fitted to the 370mm rotors -the hat radius is smaller than in the 380mm rotor by more than the 10mm difference in diameter. So the Sport pad is missing more than 10mm of rotor contact surface. This fact is not unusual as you may see the same lack of total contact surface in the CCB rotors with these calipers. It cannot be easily noticed just because the rotors are dark grey and the area without pad contact looks almost the same as the rest of the rotor. In the iron rotor the non-contact area will be covered in rust in no time. Braking difference is negligible.

There are other pads that fit those 4-piston calipers that can reduce that non-contact area by 5-8mm. This may have worked before, but now the proper way is to replace the 370mm rotors with the 380mm.
Great info. Thanks. I will be ordering the 380mm rear rotors. Even though the braking difference is negligible. The lack of total contact coverage with the OEM pads has my OCD on overdrive. Not to mention the rust build up that will accumulate on the inner ring of the 370mm rotors.

Last edited by Bluer2; 02-27-2019 at 02:18 AM..
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