Hi:
I have a squeaking high pitch rear wheel. It will not squeak when it has been sitting for an hour+, but when I drive it and apply the breaks it will start squeaking and continue to forward and in reverse, so I think it might be brake related. It did have a new brake job done before I bought it but it is only one of them. Any idea how to diagnose the problem further? Thanks.

 

Take a video, and post it on youtube. It may be nothing. It's hard/impossible to say without hearing the noise.

Good Luck!