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Does it seem to do it going around corners more? Can you do any driving maneuver to make it stop or quiet?
Is this an all wheel drive model?
I suspect you have a wheel bearing going bad on the rear. or the rotor is hitting something
Yes its possible that it is related. Couple of things I would look at. Make sure calipers move freely. They should slide on pins with very little resistance. When up on jack apply brakes and make sure wheels spin as soon a pedal released. You could have a hydraulic problem causing fluid pressure to not be released.
Are you able to remove caliper? Sounds like you have a sticking caliper. Or slide. If you can remove caliper I would try spinning and see if it's easier. If it is that will tell you that your problems is brakes. Either caliper sticking. Slide pins sticking.
Did you figure anything out?
Sounds like we are getting this narrowed down. Where did you get the rear brake pads? Are they semi metallic or ceramic?
If they are ceramic the likely hood of a squeak is very little. I suspect they are semi metallic.
So it doesnt squeak when you are turning it? unless you are applying the parking brake it wouldnt be squeaking. this has the drum brakes inside the rear rotor for the parking brake. I am suspect that the brake pads are to blame. Please note all of the mounting surfaces and the pads where they contact any metal mounting should be lubricated using a sil glyde or brake lubricant. If they are not lubed they will squeak.