Cracked Brake Disk After 1 Track Day
Discussion
Seasider said:
You might want to remove the Manufactures name 
Replace with a subtle hint
I think it's a bit late for that now, plus they performed brilliantly until they cracked so there are plusses. Replace with a subtle hint I thought it might be a one off since the guys on the BMW forum swear by them. Interesting to hear that griffs suffer with the problem as well. My car's probably 300kg heavier too. I'm going to write to the manufacturer, but I think it's likely that they'll write them off as they've been used on the track.
Unless you go for a disc pad setup specifically designed for the track by the likes of Alcon, AP, Brembo paired with Race pagid pads, perf friction, Hawk, etc, rather than a Demon Tweeks 'Fast Road' (?) setup you will always encounter problems... As for EBC pads... See if any race series or trackday regular uses them.....
fergus said:
As for EBC pads... See if any race series or trackday regular uses them.....
Mines a road car 
that occasionally ventures onto a track...
If i was tracking regularly i would've changed/upgraded the lot, as it was replacement/slight upgrade of worn original parts they feel fine and better than standard to me (choice was swayed after seeing the other thread
) That isn't normal and it isn't safe. The normal type of failure in my experience is that the surface of the disc gets fine cracks all over it (I believe from differential expansion of the inside and outside of the disc) and these gradually join up to form structural cracks. What you have looks like a single big crack. I would think either the disc had a manufacturing flaw at that point which started the crack, or there something unusual about your brakes (for example, small calipers right at the edge of a big disc can produce some funny heat distributions and thermal stresses) which is stressing the discs. They look quite rusty so presumably they're far from new.
EBC pads work and suffer from fade far less than most. Problem as Peter, I and numerous others track regulars have found is that they are incredibly hard on disks, have little feel and really aren't as nice as others (eg tarox, mintex, pagid etc). I've used red ones on my Saab too and they again were better than the std pads but were hard as rock!
I've replaced these disks with EBC turbo grooves to see if they fare any better.
The disk broke when I was making progress on a stretch of twisty back road. I was using the brakes a lot so they would have got pretty hot.
Looking at the other thread, the crack looks identical! A common fault maybe?
I'm going to be keeping the car for a while yet so my plan now is to do a fairly major brake upgrade whereby my disks increase in diameter by 4cm and in width by a couple of mm. That should improve everything.
Thanks for your responses.
The disk broke when I was making progress on a stretch of twisty back road. I was using the brakes a lot so they would have got pretty hot.
Looking at the other thread, the crack looks identical! A common fault maybe?
I'm going to be keeping the car for a while yet so my plan now is to do a fairly major brake upgrade whereby my disks increase in diameter by 4cm and in width by a couple of mm. That should improve everything.
Thanks for your responses.
ehasler said:
I'm sure everyone has their most/least favourite pad/disk (I wasn't that impressed with the set of Pagid pads that I last ran in my race car), but fergus was implying that no self-respecting driver would use EBC, which isn't the case at all.
Sort of, but if you look at the caliper applications available from the EBC stable, they don't cover many of the larger calipers e.g. pure race calipers, compared to Pagid for example. I wasn't suggesting anything else....
I suspect a set of Pagid RS15s will outlast and outperform a similar set of EBC pads (i.e. similar mu and temp rating) although for a 911 for example, will be about £220-£280 per axle set. You get what you pay for at the end of the day....
bennyboysvuk said:
I'm going to be keeping the car for a while yet so my plan now is to do a fairly major brake upgrade whereby my disks increase in diameter by 4cm and in width by a couple of mm. That should improve everything.
That's a significant change, have you thought about what this will do to the brake balance?
fergus said:
Sort of, but if you look at the caliper applications available from the EBC stable, they don't cover many of the larger calipers e.g. pure race calipers, compared to Pagid for example. I wasn't suggesting anything else....
I suspect a set of Pagid RS15s will outlast and outperform a similar set of EBC pads (i.e. similar mu and temp rating) although for a 911 for example, will be about £220-£280 per axle set. You get what you pay for at the end of the day....
Fair enough. I agree you won't find any of the F1 teams running EBC pads, but they seem to be aimed more at the club end of racing and there are plenty of people who are happy with them there. I suspect a set of Pagid RS15s will outlast and outperform a similar set of EBC pads (i.e. similar mu and temp rating) although for a 911 for example, will be about £220-£280 per axle set. You get what you pay for at the end of the day....
I've not used EBC, but they're on the shortlist when I replace the brakes on my race car. The current set of Pagids (~£160 for the set) were worse than the £45 Hawke pads I ran before, so you don't always get what you pay for
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