Groove in FR rotor

435MSport6Speed · 06-17-2021, 09:38 PM

11,000 on brakes. No noise or vibration. Anyone have an idea of what's going on?

Thanks for the help.

Logicoeur · 06-17-2021, 10:50 PM

Debris took a trip between the pad and rotor.

Billfitz · 06-18-2021, 07:32 AM

That. Don't worry about it, it's not wide enough to create any problem. If you had a bunch of them then you'd want to resurface the rotor, and replace the pad if it was scored as well. Whatever you did to one side you'd do to the other as well, to keep them the same.

435MSport6Speed · 06-18-2021, 10:15 AM

Quote:

Originally Posted by Billfitz

That. Don't worry about it, it's not wide enough to create any problem. If you had a bunch of them then you'd want to resurface the rotor, and replace the pad if it was scored as well. Whatever you did to one side you'd do to the other as well, to keep them the same.

Thanks Bill

cfm56d7b · 06-18-2021, 11:23 AM

435MSport6Speed, what brake pads does your vehicle have? OEM or aftermarket?

435MSport6Speed · 06-18-2021, 11:38 AM

Quote:

Originally Posted by cfm56d7b

435MSport6Speed, what brake pads does your vehicle have? OEM or aftermarket?

OEM. Blue caliper M brakes.

cfm56d7b · 06-18-2021, 12:03 PM

Quote:

Originally Posted by 435MSport6Speed

OEM. Blue caliper M brakes.

Thanks for confirming. OEM pads are softer by design to preserve rotor life. It's most likely road debris.

I haven't seen road debris getting trapped between the pad and the rotor.

On a rare chance that brake pad has been tapered for some reason - in other words uneven pressure resulting in one corner having a slight gap - it's worthwhile to inspect the brake pad when you have a chance.

casualDIYer · 06-19-2021, 10:41 AM

Whatever you got got in there must have been pretty durable to cut a little line in the rotor. As bill mentioned, I wouldn't worry about.

06-17-2021, 09:38 PM	#1
435MSport6Speed Captain 432 Rep 814 Posts Drives: 435i M Sport 6 Speed Join Date: Mar 2015 Location: Mass iTrader: (0)	Groove in FR rotor 11,000 on brakes. No noise or vibration. Anyone have an idea of what's going on? Thanks for the help. Attached Images __________________ 14 435i M Sport 6 speed, MG/Coral, MusicarNW Stage 3+ Upgrade for HK, M Brakes, MPPK, MPE, M Rear Spoiler, M Side Molding, full Expel wrap Last edited by 435MSport6Speed; 06-17-2021 at 09:56 PM..
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06-17-2021, 10:50 PM	#2
Logicoeur Lieutenant Colonel 988 Rep 1,934 Posts Drives: F30 335i xDrive Join Date: Feb 2018 Location: Boston iTrader: (0)	Debris took a trip between the pad and rotor. __________________ F30 335iX \| Remus Axleback \| Fabspeed Catted DP \| VRSF Comp IC \| 18X9 ET35 19lb MT1 \| 255/40/18 ECS \| Ohlins RT Millway Street \| Millway Control Arm Bushings \| Turner Endlinks \| TMH 75mm 14x1.5 Studs \| BMW MPerf LSD \| XDelete \| Pipercross Filter \| MHD Stg2 93
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06-18-2021, 07:32 AM	#3
Billfitz Lieutenant General 8210 Rep 16,039 Posts Drives: '15 328iX GT Join Date: Jan 2015 Location: New Hampshire iTrader: (0)	That. Don't worry about it, it's not wide enough to create any problem. If you had a bunch of them then you'd want to resurface the rotor, and replace the pad if it was scored as well. Whatever you did to one side you'd do to the other as well, to keep them the same.
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06-18-2021, 11:23 AM	#5
cfm56d7b Lieutenant General 5876 Rep 10,247 Posts Drives: 2017 440i Gran Coupe & 2015 X5 Join Date: Nov 2012 Location: Orange County, CA iTrader: (2)	435MSport6Speed, what brake pads does your vehicle have? OEM or aftermarket?
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06-19-2021, 10:41 AM	#8
casualDIYer Major 432 Rep 1,363 Posts Drives: 340i xDrive M Sport Join Date: Nov 2008 Location: Toronto iTrader: (0)	Whatever you got got in there must have been pretty durable to cut a little line in the rotor. As bill mentioned, I wouldn't worry about. __________________ 340i xDrive (F30), 228i (F22), 320 (F30), 325i (E46)
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