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At what point do you guys scrap your front rotors?

I have the stock rotors but they were cryo treated and grooved.

They have about 4k miles on them but are covered with spider cracks and recently have about an inch of blue appearing on the outside edge,,,, but they still brake fine.
 

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Brakes are way too important to take chances. :screwy: Get rid of them.They're cheaper than collision repair :blush:
 

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A real rough thumbrule is if you can get a fingernail in them, time to ditch them. Here are a few pics of my stock rotors in various stages of life.

New rotor:


Used but still good rotor:


Spider cracks nearing point where I won't use them on the track:


Spider crack gone too far (this is very rare and I believe crack propagated rapidly on cooldown in pits - caught in routine pre-track session checks)
 

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Sub,

excellent learning tool here. I am new to DE's and it's great to see the wear progression on the rotors so I will know what to look for when mine get there, to ensure I don't let them go too far.

Excellent advice as usual, and your visual aids are outstanding :thumb:
 

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I have ditched my front rotors at the spider-crack stage - twice. Went through 1 set of rears in the same time period.
 

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Backlash said:
The stock rotors are so cheap, it's not worth screwing around with running them too long. I keep an extra set around, such that I can change when needed.
That is good advice. They are only $25 a pop at NAPA. I always take three fulls sets with me to the track (one on the car and two spares).

That last pic above really got away from me fast, which is a good reason why you should give them a visual inspection before every single track session. You can see that rotor hasn't even really started to spider crack yet. Just the one crack that went clean through. :eek:
 
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