CCB disc wear interpretation

FormulaMMM · 06-17-2020, 07:07 PM

Spotted some pitting on my right front disc during a post-track check this evening. The three indicators on that disc are pictured below. Other discs are not equally affected.

Comparing these wear indicators to those detailed in version 1 page 2 of the service bulletin here: https://f80.bimmerpost.com/forums/sh....php?t=1115439

If continuous, uninterrupted pits or
cavities in the surface are visible at the
indicators (1) > 1 cm² or surface pitting
>50% (entire surface of an indicator is 2
cm²)
-> Replace the brake disc!

Thoughts?

Pad wear status (original) is final pic and included for reference.

Performance was ideal, but might be time to call Essex after all. I'm 4 events in, with 1.5 of those being wet.

I'm due for a brake fluid change under warranty, so will get a master tech's thoughts as well.

Untitled by FormulaMMM, on Flickr

redrumm3 · 06-17-2020, 07:21 PM

Quote:

Originally Posted by FormulaMMM

Spotted some pitting on my right front disc during a post-track check this evening. The three indicators on that disc are pictured below. Other discs are not equally affected.

Comparing these wear indicators to those detailed in version 1 page 2 of the service bulletin here: https://f80.bimmerpost.com/forums/sh....php?t=1115439

If continuous, uninterrupted pits or
cavities in the surface are visible at the
indicators (1) > 1 cm² or surface pitting
>50% (entire surface of an indicator is 2
cm²)
-> Replace the brake disc!

Thoughts?

Pad wear status (original) is final pic and included for reference.

Performance was ideal, but might be time to call Essex after all. I'm 4 events in, with 1.5 of those being wet.

I'm due for a brake fluid change under warranty, so will get a master tech's thoughts as well.

Untitled by FormulaMMM, on Flickr

Definitely showing some fatigue. Have you weighed the rotors? Need to do that to determine the wear.

Suds · 06-17-2020, 07:22 PM

I would want to take a good look at the other side of the rotors.

SYT_Shadow · 06-17-2020, 07:25 PM

Doesn't look good!

AP or PFC are good bets

Day Laborer · 06-17-2020, 07:36 PM

How many estimated track days?

CanAutM3 · 06-17-2020, 07:59 PM

The answer lies in your first picture. Get the rotors weighed

.

FormulaMMM · 06-17-2020, 08:30 PM

Quote:

Originally Posted by Suds

I would want to take a good look at the other side of the rotors.

I'll see if I can get a peek around the dust shield tomorrow.

Quote:

Originally Posted by Day Laborer

How many estimated track days?

In original post. 4 total, 2 fully dry, one afternoon in mixed conditions.

Call it ~15 dry sessions total, not many of which were clear running. Still meat left on the original pads.

Quote:

Originally Posted by CanAutM3

The answer lies in your first picture. Get the rotors weighed

.

Will do. But is your read of the bulletins that the weight is the deciding factor? I'm interpreting the bulletin as -- if the indicators are pitting to a certain point, then replace. no mention of weight.

redrumm3 · 06-17-2020, 09:19 PM

Weight is ultimately going to be the determining factor with carbon rotors. Wear indicators are doing what they are supposed to do.

06-17-2020, 07:07 PM	#1
FormulaMMM Brigadier General 3663 Rep 3,422 Posts Drives: E90 M3 Join Date: Oct 2011 Location: Midwest iTrader: (2)	CCB disc wear interpretation Spotted some pitting on my right front disc during a post-track check this evening. The three indicators on that disc are pictured below. Other discs are not equally affected. Comparing these wear indicators to those detailed in version 1 page 2 of the service bulletin here: https://f80.bimmerpost.com/forums/sh....php?t=1115439 If continuous, uninterrupted pits or cavities in the surface are visible at the indicators (1) > 1 cm² or surface pitting >50% (entire surface of an indicator is 2 cm²) -> Replace the brake disc! Thoughts? Pad wear status (original) is final pic and included for reference. Performance was ideal, but might be time to call Essex after all. I'm 4 events in, with 1.5 of those being wet. I'm due for a brake fluid change under warranty, so will get a master tech's thoughts as well. Untitled by FormulaMMM, on Flickr Untitled by FormulaMMM, on Flickr Untitled by FormulaMMM, on Flickr Untitled by FormulaMMM, on Flickr __________________ M4 GTS, GT3, C63 S \| E90 M3s, E39 M5
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06-17-2020, 07:22 PM	#3
Suds /M Enthusiast 1599 Rep 1,618 Posts Drives: Responsiblish Join Date: Aug 2010 Location: Lone Star State iTrader: (1)	I would want to take a good look at the other side of the rotors. __________________ 2019 M2 Comp, Alpine White, DCT, track car build, 1/2 cage, AP Racing Brakes & Nitron Coilovers, BM3 Stage 1 93 Oct. 2018 Porsche Cayman GTS, Night Blue Metalic, PDK, COBB tuned 93 Oct. 2004 Audi A4 Avant USP 6mt, RS4 clutch, built motor, Garrett GT3071r "Big Ass Turbo" Motoza Tune
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06-17-2020, 07:25 PM	#4
SYT_Shadow ///M Powered for Life 11480 Rep 10,328 Posts Drives: E90M/E92M/M4GTS/M4GT4/X5M Join Date: Sep 2010 Location: Greenwich, CT iTrader: (2)	Doesn't look good! AP or PFC are good bets __________________ DIY: S65 Rod Bearings E9X PFC Z54 BBK on F8X BK harness bar + seats: fit 6 tires in an M3 do88 Cooling Goodies GTS Twins: GTMore project
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06-17-2020, 07:36 PM	#5
Day Laborer Lieutenant Colonel 1746 Rep 1,889 Posts Drives: M5 CS / iX 50i Join Date: Dec 2009 Location: NY, NY, CT, PA, MD, VA, DE, FL iTrader: (11) Garage List [0.00]	How many estimated track days? __________________ https://www.instagram.com/day_laborer/ *(DM me from this account)* Email: nextlevelautobrokersdc@gmail.com Part-time with Next Level Auto Brokers, LLC https://www.instagram.com/nextlevelautobrokers/
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06-17-2020, 07:59 PM	#6
CanAutM3 General 21117 Rep 20,741 Posts Drives: 2021 911 turbo Join Date: Jan 2012 Location: Montreal iTrader: (1) Garage List 2022 Audi RS6 [10.00] 2021 Porsche 911 turbo [10.00]	The answer lies in your first picture. Get the rotors weighed . Attached Images __________________ Porsche 911 turbo 2021 992 GT Silver Previous cars: M4cs 2019 F82 Limerock Grey / M4 2015 F82 Silverstone / M3 2008 E92 Silverstone / M3 2002 E46 Carbon Black
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06-17-2020, 09:19 PM	#8
redrumm3 Second Lieutenant 417 Rep 261 Posts Drives: M4 GTS, M3 GT4, E30 M3... Join Date: Mar 2012 Location: FL iTrader: (0) Garage List 2009 BMW M3 GT4 [0.00]	Weight is ultimately going to be the determining factor with carbon rotors. Wear indicators are doing what they are supposed to do.
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