I have a 2003 GS300, a couple of days ago I started hearing a squealing sound coming from the rear. It doesn't happen all the time, sometimes when I reach around 35 mph it will start, after I get to around 40 mph it will stop. Sometime I can drive at any speed and hear nothing. Has anyone experienced this, any suggestions will be greatly appreciated. Thank you.

 

What's the noise? Might be the brakes or a wheel bearing going out? Have the wheel bearings ever been done? Last maintenance on the brakes being done.