Brake rotor vane cracks normal?

2fast4 · 03-18-2016, 02:52 PM

I was checking brakes and wheels and saw "hairline" cracks on rotor vanes on my Stoptech slotted front rotors.

At the tip of vanes the cracks are jagged, but the I can see the "straight" line going down. All of them has the hairline cracks. The straight lines seems like manufacturing process because of the straightness where they fused together 2 pieces but not sure.

It brakes fine otherwise.

Is it normal?

david in germany · 03-18-2016, 02:58 PM

I don't see any cracks, those are casting lines.

2fast4 · 03-18-2016, 03:09 PM

A the tip there are jagged lines but not easy to see since small area. But I agree with straight lines being casting lines.

03-18-2016, 02:52 PM	#1
2fast4 Second Lieutenant 30 Rep 285 Posts Drives: 2008 BMW 335i Join Date: Sep 2013 Location: Phoenix, Azz iTrader: (0)	Brake rotor vane cracks normal? I was checking brakes and wheels and saw "hairline" cracks on rotor vanes on my Stoptech slotted front rotors. At the tip of vanes the cracks are jagged, but the I can see the "straight" line going down. All of them has the hairline cracks. The straight lines seems like manufacturing process because of the straightness where they fused together 2 pieces but not sure. It brakes fine otherwise. Is it normal?
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03-18-2016, 02:58 PM	#2
david in germany Lieutenant Colonel 729 Rep 1,815 Posts Drives: 118i, 335i and 328i Join Date: Nov 2011 Location: Mannheim Germany iTrader: (2)	I don't see any cracks, those are casting lines. __________________ 2009 118i Monaco Blue "Maximillion" 2009 335i Saphire Black M Sport "Leopold" Cobb stage 2 aggressive tune, Mishimoto FMIC, Cobb charge pipe, Cobb catted down pipes, Forge diverter valves, BMS inlets and DCI, Cyba scoops and M Individual Audio retrofit and M3 gauge cluster retrofit. 2011 328i Titan Silver M Sport "Franzel" <--Wife's car
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03-18-2016, 03:09 PM	#3
2fast4 Second Lieutenant 30 Rep 285 Posts Drives: 2008 BMW 335i Join Date: Sep 2013 Location: Phoenix, Azz iTrader: (0)	A the tip there are jagged lines but not easy to see since small area. But I agree with straight lines being casting lines.
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