Sry @skswat, but fail. We've proven with telemetry the brake temperature at the rear brake just dies. Neither the tires, they were attached three, four or five rounds before this happened, nor was there a loss of grip. Someone just threw a can of nitrogen at the rear brakes.
Im not talking that this was reason for your issue. I just asked different question.. but found this thread where I saw mentioned something about dirt on tyres... so is dirt on tyres considered, or it does not affect grip at all?
So you're a thread-hijacker. Personally I've noticed a couple of times with powerful cars, like the DTM 2015, that there is no or at least very little grip traction for some seconds, whenever I've decided it is time for some rallycross. So I'd anwer, Yes, dirt on tires affects your car.
Yes there is. I think the feature came with the DTM 2015 update. The amount of dirt is visualized by HUD Dash for example. https://play.google.com/store/apps/details?id=de.barz.hud_dash&hl=de