Have you seen this before?

griebel · 07-25-2018, 04:34 PM

I just did a brake job on my F30 2012 335i. New zimmerman rotors and TRW brakes. I am getting a line like this on both sides. I have no idea what I could have screwed up. Any ideas?

rak299 · 07-25-2018, 04:44 PM

Do you mean both rotors or both sides of that rotor?

griebel · 07-26-2018, 06:40 AM

On left and right side of car

Tribalpinoy911 · 07-26-2018, 06:48 AM

Are the pads properly set in? Piston not siezed?

griebel · 07-26-2018, 10:31 AM

Pistons were fine and the pads slide right in without any problem.

rphz · 07-26-2018, 10:48 AM

How many miles have you driven on them and have you gone through a bedding process? Looks like they just haven't worn through the zinc coating yet.

Orion4 · 07-26-2018, 12:42 PM

Does that feel like its scored/gouged or still smooth like the coating has not been removed yet? In either case it is odd that you have the same issue on both rotor. Normally, I would think either the pad face is not completely flat or the rotor is not. Odd!

wdeerfield · 07-26-2018, 02:50 PM

that looks like you havent bed them in or used them enough to remove the coating on the face of the rotor surface.

a803sgo · 07-26-2018, 04:33 PM

Had this once, bit of crap stuck to the pad.

griebel · 07-27-2018, 07:32 AM

Only about 20 miles on new pads. Probably just not enough miles yet. No ridge or anything like that.

kern417 · 07-27-2018, 07:37 AM

I have the same thing on my stock setup. Coming up on a year of ownership/5k miles of driving and wasn't sure what caused this since nothing has been touched. I'm thinking about upgrading to slotted rotors to help mitigate buildup on the mating surfaces. I have like 2-3 lines like that on each rotor.

07-25-2018, 04:34 PM	#1
griebel Private First Class 61 Rep 116 Posts Drives: Z4M Join Date: May 2018 Location: Oregon WI iTrader: (0) Garage List 2022 BMW X4 [0.00] 2018 M4 [0.00] 2008 Z4M [0.00]	Have you seen this before? I just did a brake job on my F30 2012 335i. New zimmerman rotors and TRW brakes. I am getting a line like this on both sides. I have no idea what I could have screwed up. Any ideas? Attached Images
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07-25-2018, 04:44 PM	#2
rak299 Major 601 Rep 1,048 Posts Drives: 2021 M3 6MT Join Date: Sep 2016 Location: san francisco iTrader: (0)	Do you mean both rotors or both sides of that rotor?
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07-26-2018, 06:40 AM	#3
griebel Private First Class 61 Rep 116 Posts Drives: Z4M Join Date: May 2018 Location: Oregon WI iTrader: (0) Garage List 2022 BMW X4 [0.00] 2018 M4 [0.00] 2008 Z4M [0.00]	On left and right side of car
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07-26-2018, 06:48 AM	#4
Tribalpinoy911 First Lieutenant 93 Rep 397 Posts Drives: F34 Join Date: Apr 2018 Location: NV iTrader: (0)	Are the pads properly set in? Piston not siezed?
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07-26-2018, 10:31 AM	#5
griebel Private First Class 61 Rep 116 Posts Drives: Z4M Join Date: May 2018 Location: Oregon WI iTrader: (0) Garage List 2022 BMW X4 [0.00] 2018 M4 [0.00] 2008 Z4M [0.00]	Pistons were fine and the pads slide right in without any problem.
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07-26-2018, 10:48 AM	#6
rphz Second Lieutenant 70 Rep 206 Posts Drives: 2014 F32 435xi Join Date: Nov 2016 Location: Colorado iTrader: (0)	How many miles have you driven on them and have you gone through a bedding process? Looks like they just haven't worn through the zinc coating yet.
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07-26-2018, 12:42 PM	#7
Orion4 Lieutenant Colonel 481 Rep 1,572 Posts Drives: 2013 335i Sport Line Sedan Join Date: Aug 2009 Location: Melbourne, FL iTrader: (0)	Does that feel like its scored/gouged or still smooth like the coating has not been removed yet? In either case it is odd that you have the same issue on both rotor. Normally, I would think either the pad face is not completely flat or the rotor is not. Odd!
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07-26-2018, 02:50 PM	#8
wdeerfield A family of bimmers 2747 Rep 7,742 Posts Drives: '18 G01 X3M40i Join Date: Jan 2012 Location: Clifton Park, NY iTrader: (0)	that looks like you havent bed them in or used them enough to remove the coating on the face of the rotor surface. __________________ 2018 PB/Black G01 X3M40i \| 699M \| ZDA \| ZPP \| ZPX \| Maxton front lip \| X3M vents \| 15mm Spacers \| Diamond G20 style grills
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07-26-2018, 04:33 PM	#9
a803sgo Captain 170 Rep 616 Posts Drives: BMW 320D M-SPORT (F30) Join Date: Apr 2015 Location: Kent, UK iTrader: (0)	Had this once, bit of crap stuck to the pad.
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07-27-2018, 07:32 AM	#10
griebel Private First Class 61 Rep 116 Posts Drives: Z4M Join Date: May 2018 Location: Oregon WI iTrader: (0) Garage List 2022 BMW X4 [0.00] 2018 M4 [0.00] 2008 Z4M [0.00]	Only about 20 miles on new pads. Probably just not enough miles yet. No ridge or anything like that.
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