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Don't let the absence of spider cracks

Old 06-14-2009, 04:28 AM
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WNeal
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Default Don't let the absence of spider cracks

Fool you. It did me.
I look at the rotors every time I go to an event and after every session but I don't always take the wheels off.
Flipping tires today and the left rear rotor had a 1.5" through and through crack extending to the outside of the rotor on it.

Had I just looked at the rotor with the wheel on, I most likely would have missed it and not even suspected it due to the very good looking rest of the rotor.
It must have cracked during the end of my last session because I did not feel it at all. Glad it did not come apart on me. It was not there when I put new brakes on before the last event.
I will now be taking all 4 wheels off and checking the rotors prior to each event

Just a lesson learned to share.




Will post a pic in the AM when I get my camera out of the truck.

Last edited by WNeal; 06-14-2009 at 11:00 AM. Reason: Added photo
Old 06-14-2009, 06:16 AM
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varkwso
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Originally Posted by WNeal
Fool you. It did me.
I look at the rotors every time I go to an event and after every session but I don't always take the wheels off.
Flipping tires today and the left rear rotor had a 1.5" through and through crack extending to the outside of the rotor on it.

Had I just looked at the rotor with the wheel on, I most likely would have missed it and not even suspected it due to the very good looking rest of the rotor.
It must have cracked during the end of my last session because I did not feel it at all. Glad it did not come apart on me. It was not there when I put new brakes on before the last event.
I will now be taking all 4 wheels off and checking the rotors prior to each event

Just a lesson learned to share.


Will post a pic in the AM when I get my camera out of the truck.

good catch - rotors can sneak up on you
Old 06-14-2009, 08:20 AM
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Good catch! One of the reasons I recommend everybody get an electric impact gun is so that you can do inspections like this easily after each run.
Old 06-14-2009, 08:46 AM
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urslooow
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hoffman can you reccomend a brand, and website to get the best deal on the impact gun, I'm still doin it by hand!

Remember to look at the inside surface of the rotor while bleeding your brakes pre event!

Last edited by urslooow; 06-14-2009 at 08:47 AM. Reason: additional comment
Old 06-14-2009, 09:02 AM
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I have had about 3-4 in the last 20 years, I now have a 28V Li-ion Milwaukee. I have 2 of the drills as well (so one can stay clean for woodworking) that use the same batteries. Bigger is better in this game, who cares what it weighs?
Old 06-14-2009, 11:00 AM
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Old 06-14-2009, 11:20 AM
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Notice it is on the outside of the rotor, it almost always is.
Old 06-14-2009, 02:25 PM
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Originally Posted by ghoffman
Notice it is on the outside of the rotor, it almost always is.
I am assuming this is because the stock cooling duct is on the inside, thus allowing the outside to soak up more heat ?
Old 06-14-2009, 02:36 PM
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Same amount of heat, but less or non existant cooling on the outer surface creating and gradient. With a 4 or 6 piston caliper, the outer seals always go bad first.
Old 06-14-2009, 03:00 PM
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So we have spindle ducts for the inside, why not a carbon fibre piece that wraps around the rotor, like the caliper, to put air on the outside? With 18" wheels and 13" or 14" rotors it seems like there's quite a bit of room?
Old 06-14-2009, 03:12 PM
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Oh, you mean like this:
Old 06-14-2009, 03:18 PM
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Originally Posted by ghoffman
Oh, you mean like this:
Yeah, only that's a bit out of most people's price range. It is sure sexy though. Any poor man's solutions for the outside? And will titanium backing plates significantly help to reduce temperatures of the seals? Sorry for the hijack.

San
Old 06-14-2009, 03:18 PM
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Yup. Or something separate from the caliper similar to the spindle ducts.
Old 06-14-2009, 04:10 PM
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Are those Napa or other?
Old 06-14-2009, 05:14 PM
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Sounds like a business opportunity to me (not me!)! Even if you do not affect the caliper it would help.
Old 06-14-2009, 06:25 PM
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I've typically felt cracks like that through the brake pedal. All were due to inadequate cool-down before parking the car, so the 'thump' was felt when I went out for another session.
Old 06-14-2009, 11:16 PM
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Originally Posted by WNeal
Fool you. It did me.
I look at the rotors every time I go to an event and after every session but I don't always take the wheels off.
Flipping tires today and the left rear rotor had a 1.5" through and through crack extending to the outside of the rotor on it.

Had I just looked at the rotor with the wheel on, I most likely would have missed it and not even suspected it due to the very good looking rest of the rotor.
It must have cracked during the end of my last session because I did not feel it at all. Glad it did not come apart on me. It was not there when I put new brakes on before the last event.
I will now be taking all 4 wheels off and checking the rotors prior to each event

Just a lesson learned to share.




Will post a pic in the AM when I get my camera out of the truck.

You would have felt that at the first corner, good catch.

Old 06-16-2009, 05:17 PM
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Originally Posted by froggy47
You would have felt that at the first corner, good catch.

This happened to me Sunday...1st session over---car cooled---2nd session started I could feel the cracked rotor through the pedal the first time I applied the brakes.

Last edited by NemesisC5; 06-16-2009 at 07:35 PM.
Old 06-16-2009, 06:38 PM
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Originally Posted by NemesisC5
Are those Napa or other?
NAPA
had a set of GM OEM that I just put on

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