Any idea where the noise is coming from - front/back, right/left?
And what is the condition of your brakes?
Let's keep an eye on this thread, something might pan out of it. Otherwise, try some of the troubleshooting recommended in it and let us know what you find.
brakes-squealing-03-m45-t613541.html
However, if you can record a video of it, that would helpful too.