The car has been through 2 track days, one at NJMP lightning and the other at Pocono raceway( 3 heats of south/east and 1 on North). I am running Carbotech xp10 in the front with centric premium rotors. Only time I think I was extremely hard on the brakes was on the North course when it got a little congested coming off the oval. Do you think I need new rotors?

 

What do the pads look like?

Do both front rotors look like that?

 

Is that from the ABS or are they warped?

 

Now that you mention it, I think my abs kicked on once but very brief. Both front rotors are like that. The rotors are not warped though. I'm not getting any pedal vibrations. The pads look fine. Still stops on the dime. I swapped the pads out for HPS pads after the track.

 

Did you bed them in? Changing pad compound without changing rotor?

Was that picture before you changed to Hawks? Did you have Hawks on these rotors before switching to Carbotechs?

 

Take this with a grain of salt, but that looks like smeared brake pad more than damaged rotor. Maybe your overheating the pad (not terribly uncommon for xp10s).

 

This was before I switched back to the hawks. I broke in these rotors with the carbotech pads but use hawk pads when i'm not at the track. I put very little mileage on the rotors with the hawk pads in between track days.


I was thinking that as well. I'm going to check on it again after a little driving.

 

(That's what I was thinking)

But alternating pad compounds on the same rotor can cause uneven deposit and bedding, so that's my alternate explanation.

 

I get the same thing on hawk HP plus. Pads are overheated. Though the I'm thinking the pattern you have is from overheat and abs activating. Typically it wears off in about 100 miles or so.

 

Just looks like nasty uneven pad deposits properly caused by swapping between pad compounds or too much variance in brake temps throughout the day. I would do some normal driving for awhile with the XP10s on to try and remove the deposits and then make sure to do a more thorough bed-in with the XP10s before the next time at the track.

I have found I need to do 2-3 cycles to build up a good transfer layer with track pads. A cycle usually being about 6-10 hard 60-5mph stops one after the other until I get some fade and let the pads cool back down while at cruising pace.

It can be difficult to maintain the transfer layer if you aren't using the brakes in a consistent way. Going really easy on the brakes most of the day with them below their optimal temperature will just cause the transfer layer to be eaten away by the high coefficient track pads. So doing that and then going into a session where you are extremely hard on the brakes could definitely cause weird deposits and even some vibration through the pedal if it is bad.