Old Fluid is the biggest cause of brake fade. I changed my fluid after every 3 or 4 events if possiable and at the beggining of every track season. I have always use Valvolin Sythmpower and it ralrey fades when fresh, brake fluid loves to suck up moistuer epsically after it is heated a cooled a few times. So I always try to make sure I have as fresh as fluids as possiable