Brake has junk on it at the track

[2013MustangGT]

I was at ECR yesterday and just before my last session I was checking my lugs and found this



Doesn't look like brake fluid. Looks like bird poop. I cleaned it off and tried to see if the brake might be leaking. However, I just couldn't get them hot like yesterday. The session before the brakes felt a little weak, but I just thought that was the pads as the peddle never went to the floor. Any ideas what it could be?

Side note: I am glad I have my trailer now.

 

[neema]

It's got to be brake fluid. Try swapping out the bleeder maybe?

Didn't Vorshlag Helicoil their Brembos from bleeding them so much?

 

[csamsh]

Happened to Terry's car-

Looks like just the bleeder

 

[2013MustangGT]

Guess I need a new bleeder.