Brake discs - rusty vanes
Discussion
The salt on the roads seems to have had a nasty effect on my rear brake discs. The discs are less than halfway through their life in terms of wear, and the braking surface is nice and clean.
These are ventilated cross drilled discs, and the vanes in the middle of the disk look very rusty (forgot to take a pic),
I am wondering whether I should replace the discs (and pads obviously), or whether this is normal and nothing to worry about.
Any thoughts?
These are ventilated cross drilled discs, and the vanes in the middle of the disk look very rusty (forgot to take a pic),
I am wondering whether I should replace the discs (and pads obviously), or whether this is normal and nothing to worry about.
Any thoughts?
blueg33 said:
Cross drilled discs out of the factory. I haven't heard of any issues with them.
It's depressingly common to see aftermarket discs which are just cast iron discs that somebody has drilled holes in to make them look more motorsport-ey. I'm sure they are great as a fashion statement but they're a bad idea from the performance point of view.The only production cars I've noticed fitted with cross-drilled rotors as standard have used very expensive steel or ceramic rotors which are not so vulnerable to fatigue failures - you ought to know if you have those, from the replacement cost if nothing else. If you do have those, that's a different matter and I expect they're fine. Corrosion might be more of an issue there since steel tends to corrode faster than iron.
GreenV8S said:
It's depressingly common to see aftermarket discs which are just cast iron discs that somebody has drilled holes in to make them look more motorsport-ey. I'm sure they are great as a fashion statement but they're a bad idea from the performance point of view.
The only production cars I've noticed fitted with cross-drilled rotors as standard have used very expensive steel or ceramic rotors which are not so vulnerable to fatigue failures - you ought to know if you have those, from the replacement cost if nothing else. If you do have those, that's a different matter and I expect they're fine. Corrosion might be more of an issue there since steel tends to corrode faster than iron.
The discs are on my Lotus Evora and from the factory are reassuringly expensive. I know that they are the original discs as I have every detail of the history. The only production cars I've noticed fitted with cross-drilled rotors as standard have used very expensive steel or ceramic rotors which are not so vulnerable to fatigue failures - you ought to know if you have those, from the replacement cost if nothing else. If you do have those, that's a different matter and I expect they're fine. Corrosion might be more of an issue there since steel tends to corrode faster than iron.
stevieturbo said:
The high end OEM "drilled" discs have the holes cast in from new, this helps to avoid the cracking issues that drilling the holes will always lead to
But in general, discs with holes are best avoided as they have a much reduced service life vs non drilled.
On my previous Evoras there were no issues with cracking, I replaced the discs when they got to their minimum thicknessBut in general, discs with holes are best avoided as they have a much reduced service life vs non drilled.
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