Brake disc crack again, is it still usable? - Alfa Romeo 4C Forums
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post #1 of 12 (permalink) Old 04-14-2019, 10:45 AM Thread Starter
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Brake disc crack again, is it still usable?

After 6 trackdays there are many small cracks on the brake rotors. Is it still safe to be use on track?SmartSelect_20190414-224334_Gallery.jpg

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post #2 of 12 (permalink) Old 04-14-2019, 11:51 AM
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After 6 trackdays there are many small cracks on the brake rotors. Is it still safe to be use on track?Attachment 97734

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Not the best photo as you canít see the entire disc better to takeoff the wheel and do an thorough inspection.
Offhand it looks OK to me as you will get those thermal surface cracks all the time. But you should look at it carefully if any of the cracks extend it to the edge of the rotor or if any of those cracks you can easily feel solidly with your finger nail across them then and you might have a problem.
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post #3 of 12 (permalink) Old 04-14-2019, 11:53 AM Thread Starter
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Not the best photo as you canít see the entire disc better to takeoff the wheel and do an thorough inspection.
Offhand it looks OK to me as you will get those thermal surface cracks all the time. But you should look at it carefully if any of the cracks extend it to the edge of the rotor or if any of those cracks you can easily feel solidly with your finger nail across them then and you might have a problem.
Thanks man, will take them off tomorrow and inspect as you suggested

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post #4 of 12 (permalink) Old 04-14-2019, 02:41 PM
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Thanks man, will take them off tomorrow and inspect as you suggested

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Call Me Al is right.. you get those surface cracks by thermal stress and as long as they are just on the surface there should be nothing to worry about.. do check it nothing in the structure of the disk and check the disk thickness regularly

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post #5 of 12 (permalink) Old 04-15-2019, 08:44 AM
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As others have indicated, those looks like surface cracks. You need to just make sure they don't become too long or close to the edge. But, If you are getting those cracks on our car, you are being aggressive on the brakes.

I would make 2 suggestions (I apologize in advance if you have done this, I don't remember):
1) Work on braking technique. Hard on, then bleed off. You can see a nice writeup here: https://driver61.com/uni/braking/
2) Perhaps it is time for brake ducts to keep the fronts a tad cooler. At the minimum, you need to paint your rotors to identify its working temperature. @Call me Al and I have used https://www.pegasusautoracing.com/pr...asp?RecId=4974
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post #6 of 12 (permalink) Old 04-15-2019, 09:05 AM Thread Starter
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As others have indicated, those looks like surface cracks. You need to just make sure they don't become too long or close to the edge. But, If you are getting those cracks on our car, you are being aggressive on the brakes.

I would make 2 suggestions (I apologize in advance if you have done this, I don't remember):
1) Work on braking technique. Hard on, then bleed off. You can see a nice writeup here: https://driver61.com/uni/braking/
2) Perhaps it is time for brake ducts to keep the fronts a tad cooler. At the minimum, you need to paint your rotors to identify its working temperature. @Call me Al and I have used https://www.pegasusautoracing.com/pr...asp?RecId=4974
All suggestions are welcome I watch almost all driver 61 video and they are very useful.

I certainly need to work on braking skill and will be easier on the brakes when I am not trying to make a good lap time in the future. The track I ran is known for harsh at the brakes, as there are 3 long straight reaching over (or close to) 180kph (about 110mph) and then full hard brakes before turning in sharp corner. Will be doing the brake ducts like someone here from Germany suggested (using the air from radiator box), and already order the flanges from the other member posted earlier.

Again, the forum is full of useful information and everyone is being so helpful

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post #7 of 12 (permalink) Old 04-15-2019, 11:24 AM
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I just installed TAROX rotors that I purchased from Alfa9. The quality is 10/10. I haven't tested them yet but I would do this upgrade if you're tracking a lot.

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post #8 of 12 (permalink) Old 04-15-2019, 12:18 PM
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I just installed TAROX rotors that I purchased from Alfa9. The quality is 10/10. I haven't tested them yet but I would do this upgrade if you're tracking a lot.
The rotors on the picture ARE Tarox


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post #9 of 12 (permalink) Old 04-15-2019, 12:56 PM
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The rotors on the picture ARE Tarox

Your Right. LOL. Hopefully, mine won't have the same issue.

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post #10 of 12 (permalink) Old 04-15-2019, 03:21 PM
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After 6 trackdays there are many small cracks on the brake rotors. Is it still safe to be use on track?Attachment 97734

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Wow is this normal wear? I have Tarox rotors as well😑. I better take a good look at mines��

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