I don't know if and how this could be related but I recently replaced my belt tensioner assembly and now I noticed that coming from both rear tires is a hissing or buzzing sound. I only hear it when I am in park and standing outside my car (with and without parking break applied). I had someone press the breaks while I listened and the noise did not change or go away. Any ideas of what it could be??? Break fluid level looks fine. Car seems to be driving good but I don't want something to go out at 60MPH.
I have a 1998 GP GT 2-Door with ABS breaks.
D