Rear knuckles cracked?

[EBinFL]

I was giving the car a once over after a recent track day and noticed what looks a little crack forming in both of the rear knuckles. Am I seeing this right- that both are cracked and need to be replaced? Or is this is normal/not dangerous and I just didn't really notice it in the past?

I'm a bit surprised it seems to be on both of the knuckles because this doesn't seem like something easy to do/break. I haven't had any insane curb strikes, offroad excursions, big pot holes, or anything like that.

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[itzTang]

It’s rubber. it’s a wear item

 

[Traxion]

That appears to be where the traction link connects right?

That is a bushing pushed inside the knuckle. Here are replacements: https://verklineusa.com/products/was-426

Should the outside of the bushing have a crack like that and it's possible a seam line? Not sure, someone else would need to go look at their car as I'm not near mine for a few hours to see if that's normal.

 

[EBinFL]

That appears to be where the traction link connects right?

Should the outside of the bushing have a crack like that and it's possible a seam line? Not sure, someone else would need to go look at their car as I'm not near mine for a few hours to see if that's normal.

It does appear to be the bushings! I should've taken a closer look at what the cracks are actually on when I noticed them - and it makes way more sense if there's some wear on the bushings vs the actual knuckle itself. I'm not sure if that's a seamline/normal for those bushings or not either though, I'll probably replace them in an abundance of caution.

 

[licklobster]

It's a seamline. They aren't solid, think of it as a gigantic rollpin. Don't bother replacing them, the new ones will be the exact same. It's part of the design.

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