I am at my wits end. I have had this reocurring problem since I've owned my 99 tacoma. I hear a chirping sound with the tire rotation on the back tires. I just had both front and rear brakes done and the sound is still there. One guy at Brakes Plus said it was brake dust and it will eventually come back even after a thourough cleaning. What perplexes me is the last time I had the front brakes done and the rears cleaned it went away for almost a year. What could be causing this and how do I get rid of it.