From my past experience, every time I crack a rotor it's usualy after the session, and off track when brakes start cooling down, last track day when I was on the track, I Felt the vibration associated with driving on cracked rotor,I immediately pulled out of session and inspected rotors, but they were fine with no cracks, but it makes me think now, can you actually crack rotors while driving on the track? or it always happens when rotors are cooling down?

 

I have only had that happen to me on cooldown but I dont see why it cant happen while driving. The fix for that buy a Racingbrake two piece rotor. Problem solved

 

Both.

 

I second this recommendation. I used to crack stock and generic rotors every track weekend. I lost a lot of track time changing rotors so I did some research and upgraded to RacingBrake two piece rotors and it was one of the best mods I've done to my car. I'm currently running the Accord caliper + RacingBrake NSX rotors and have zero issues with braking now.

 

I disagree. I had a different experience with them. Cracked after three events.



I went back to just using plain rotors again.

 

When you crack a rotor while on the track, what are the symptoms other than vibration? how dangerous is it? can you lose your brakes suddenly?

 

Eric, were you running brake ducts? What brake pads were you using? I got 23 track days on my first set of RacingBrake rotors and I've yet to crack the 2nd and 3rd sets. I ran Carbotech XP10 & enduro and Cobalt XR2 pads on them.

 

No I wasn't. I actually noticed the cracks while putting in brake ducts. I ran XP10 pads on them.

 

I cracked a rotor on track last friday at Circuit Mont Tremblant.
I must admit I ignored a little vibration and a little uneven left/right braking which should have given me a clue of what was coming.
The rotor verticaly cracked all the way and jammed in the caliper right at my braking point close to 100mph. It completely sheared the center hub part all the way around (wheel was spinning but not the disc). Lucky for me because a locked wheel would have been disastrous. I was left with one left brake and managed to save it and make the corner wide in the marbles. Epic sphincter moment...

 

Wow!! That is scary! Glad you are ok!