yeah it's purple and blue because your heating it up more then what it's made for. Basicly your causing friction like for 5mins straight and there not ment for that. Why don't you Bleed the front calipers let the piston go in all the way and then take it from there. Make sure b4 you put the Wheel on that you can spin the spindle kinda freely. You will have some resistence but for the most part that it spins with sometype of ease. Goodluck