Solved- Rotors thermal cracking already?

[MikeMM]

Ford has a 12,000 mile/1 year consumables warranty for stuff like this. I'd ask the dealership if that's something they'd be willing to shoot through the warranty process.

I'm still under a year so either way I should be good.

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[svttim]

Im not sure why Ford went with cross drilled rotors on this car. Rumor has it one of the Bosses at Ford like the look of them. Cross drilled rotors can crack and really serve no purpose other than looks and can be dangerous. The holes have a chamfered edge but the problem is that is only where they can get to them to chamfer then, not on the inside of the rotor. Im old school too and I prefer slotted but again, the design of the newer pad render the slots obsolete. All rotors will crack under track conditions. As a rule, cracking is normal and unless they are wide or to the edge there is no need to replace them. There is good reason to inspect them regularly.

 

[jmn444]

Sounds like you figured it out, it needs to be driven harder so those pads will scrub the rotors clean again

 

[Stuntman]

That's an imprint of the groove in your brake pad. Hit the brakes hard a few times and it'll wipe clean. That's not a crack.

 

[MikeMM]

That's an imprint of the groove in your brake pad. Hit the brakes hard a few times and it'll wipe clean. That's not a crack.

I added that to the first part of the thread as the conclusion because that was the issue. Little bit of sandpaper got it off.

 

[Tank]

Hey @MikeMM ,

Very much appreciate the update. Some preventative maintenance for us all!!

 

[Epiphany]

Rumor has it one of the Bosses at Ford like the look of them.

It is indeed why. Brake engineers' input was rejected in this regard. I was told this well over a year ago and that since that individual was now gone that the rotors would likely be changed to a non-drilled part and that is exactly what happened.

Funny thing is you'd think the price of the new rotors might be less. But nooo...thanks Ford!

 

[whatjones911]

That's an imprint of the groove in your brake pad. Hit the brakes hard a few times and it'll wipe clean. That's not a crack.

+1. This problem is exaggerated especially when it is wet out and/or the car was washed and not enough friction heat created to dry the pads and rotors. Rotors look fine to me. I don’t even see the inevitable superficial cracks in between the drilled holes on yours yet.

 

[Burgo]

Definitely appreciate the solid advice on track days or hard driving with drilled rotors. My route home from where I take my car to play has a solid 5 miles of brake free driving where they can cool before they sit. I have yet to track my car, so the heat cycles my rotors have seen have been minimal at best. The cracking I'm seeing is consistent with pictures of cracking I've found on cars with 15-20 track days on them.

I would never put rotors on my car that had holes drilled in them, holes cast in them yes, but drilled no. Never seen a drilled rotor that didn't crack!

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