My acl brace is squeaking?

so, i've been unfortunate enough to have torn my acl... anyway, i've had my brace for the last two months and after I wear it for about an hour (walking, running, or any other activity) it will start squeaking and it drives me (and anyone else around me) insane!!! soccer is starting and the last thing I want to worry about is my brace... I would call my pt, but i want to check online first so I don't have to bother him cause he constantly has a patient. Thanks to all!!!! :)