I was going to put this in the tech forum but I know there are always a lot of knowledgeable people talking brakes in this forum.

Anyway, I was out at the track last weekend and i had a few braking zones where the car had some funky rear brake issues. It only happened a couple times but it was unsettling nonetheless.

I believe the issue was with my right rear caliper. The one time i can recall exactly what happened was because i was braking from about 110 hugging the left side of the track when the car jumped over to the left almost taking me off track. I let off the brakes quickly, re-adjusted my point and tried braking again. This time the car braked straight and i just ended up taking the corner a little wide. Thankfully the track is wide here and i wasn't going ***** to the wall. The pavement is a little uneven in that braking zone which i thought could have been the culprit but it happened on another flat part of the track as well -- just not quite as dramatic.

Back in the pits i noticed my front rotors were clean as a whistle but my right rear pad had some uneven pad deposits. My rear left wasn't as clean as the fronts but wasn't nearly as bad as the right rear.

I'm running Racing Brake 2-piece slotted rotors in the front and rear with Hawk DTC-60'a up front and HT-10s in the rear. I'm currently using ATE superblue. I flushed the whole system the prior day.

Is it caliper rebuild time? The car has 75k miles on it and i've owned it since 19k with no real brake problems. The last 25k miles or so have seen quite a bit of track duty.

 

Any idea of caliper temps? I had one side significantly hotter than the other

I had a sticky rear piston.....and rebuilt them and they have been fine since

Rubber boot seals were cooked...and the caliper seals were much harder than the new ones

 

I didn't take any temps the last weekend but previously by the time i came into the pits from fronts were low 400's and the rears were high 300's. I think the temps left to right were pretty close to the same.

 

are you sure you don't have a rear suspension or shock problem instead?

 

No, i'm not really sure of anything at this point. How could i test if it was a shock/suspension problem? Everything looks/feels fine fine upon inspection.