Rear brakes noisy after pad and rotor replacement.

Has anyone ever had this happen? I replaced my rear brake pads and rotors on my 2012 Tundra today and when I took it for a test drive I could hear loud scrapping and a kind of squealing noise coming from the rear brakes. I jacked the truck back up and removed one wheel at a time while spinning the rear rotors. I removed one caliper and pad set at a time and spun the rotors and the noise was still there. Now All that's left is the rotors. I remove one rotor and still have the noise. I remove the other rotor and spin the axle and now there is no noise anymore. The noise was coming from the drum parking brake shoes that I never touched. I backed off on the adjuster on both rear wheels and reassembled everything. I went for another test drive and there was only a slight noise coming from the rear brakes. The more I drove the truck the more the truck the quieter the noise became until it finally stopped. I never even touched the parking brake shoes so why are they now making noise with new rear pads and rotors. I'm afraid the noise is going to come back. Any suggestions?
Thank you,
Gregg

 

Mine did/does the same thing, I just ignore it at this point.

 

It's possible you slightly bumped the dust shield into the rotor and over time it wore down. This exact thing happened to me on the front. It doesn't take much to push those cheap things into the rotor.