So, I saw this while changing my pads, rotors, and adding some brake ducts this weekend. Are these cracks a problem? Or am I concerned about nothing? Thanks.

 

You will crack them a lot. I only replaced mine once, then found out that they crack often, so I stopped replacing them. I have not tracked my S2000 in a few years though. I'm sure some one else will chime in with their opinion.

 

Mine are disintegrated.

 

No fluid leaking = O.K. I rebuild my calipers after about 12-15 track days for piece of mind but mine look like that all the time.

 

Most tracked S2000s have cracked or missing dust boots, don't worry about it.

 

Thanks all. Nothing to worry about then.