hi there
i have noticed that my AP drilled discs have started to develope cracks around the holes. the cracks go half way around the discs.

is that safe for normal use ? could these discs actually break ? anyone heard of such a thing?

cheers

sam

 

Sam.
Drilled discs are weaker than other discs because of the drilling. If you are seeing cracks appear I would suggest you consider new discs, grooved ones this time though.

Stef.

 

My Drilled AP's have similar cracks. My cracks appear to be small surface ones around the drilled holes.
I first noticed them about 3 months ago (the disks have done about 15k miles). So to be safe I ordered a set of 8 grooved disks and replacement bolt kit (you re-use the bells but tend to change the mounting bolts).
Since a few more track days were coming up I decided I wouldn't swap the disks just yet - you know, get that last bit of wear out of them. Well that was 2 track days ago and hopefully Brands to come and they have been fine.
So to answer your question, you will probably be fine on the road for a while, but order in some replacements (grooves are the recommended option) and change them when you feel comfortable.

 

drilled arent recommended for regular track use are they?

Would they not be covered under warranty?

I only bought them for looks as i am not intending to do track

Sunil