i have disk breaks on my mtn bike and since i've gotten them they sqeek, rub or make other noises.

the rotor was slightly bent for some reason, and bf straightened it out. that took care of the rub, but they still make a sqeek. seems when dirt gets in it then it sqeeks. maybe they aren't ment to be used where i live. its really dusty here or maybe i just shouldn't have them. who knows.