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Old 12-07-2017, 03:41 PM   #1
racingbrake
 
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Default BMW M3/M4 CCB and Porsche PCCB Wheel Clearance Issue?

BMW
M Carbon Ceramic Brakes - Serious Wheel Clearance Issue (rocks / stones)
http://f80.bimmerpost.com/forums/sho...t=wheel+damage
Porsche
First Day on the Road Not So Good
https://rennlist.com/forums/991/1037...t-so-good.html
Replacement PCCB Calipers
https://rennlist.com/forums/991/1037...-calipers.html
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Old 12-07-2017, 03:49 PM   #2
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997 Caliper on Left; 991 Caliper on Right:




997 caliper has leveled body



997 Caliper Installed - Even surface & clearance across the wheel barrel
Due to this caliper has an even surface (ie even clearance) it will only "admit" (& pass the rock through), or "reject" the rock. In other words it's very unlikely to let the rock "roll" between the caliper and wheel barrel.



991 caliper has two-way tapered body
Height were measured from surface plate with digitized Coordination Measurement Machine (CMM)



991 Caliper Installed - Uneven clearance (Large on outboard, tight on inboard)
This tapered body will create an uneven clearance, once a rock is trapped (on lower side-wider clearance) it will roll towards inboard (high side-tight clearance) and get pinched between the caliper and wheel barrel causing damage.

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Old 12-07-2017, 03:49 PM   #3
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This set up has been running for more than one year w/o any issue.

RB 394mm CCM rotor kit fits under 19" Mercedes (CLS550) OE wheel




Wheel clearance




Check actual clearance (4mm) with a feeler gage


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