after i drive on the highway and theo get into red light or stop and go traffic i hear a squealing noise on every rotaion but only when i have to use them alot it sounds like a rock or something is stuck between rotor and pads but once i stop and put it in park and drive again it stops.
please help

 

are you positive its the rotors?

check your u-joints
they squeal when bad on every revolution also

...zap!