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High-pitched screech from rear when backing up

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Cannot find my original post so reposting. I have a newly acquired 2005 Outback LL Bean wagon with 225,000 miles. Just noticed a horrible high-piched chirp coming from either the rear wheels or rear differential only when backing up. Touching brakes has no effect. It literally sounds like a couple of seagulls chirping. Just got the car from a dealer and original owner babied the car---I saw the records. Any thoughts?? Quick diagnostics?? Thanks in advance.
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Onyx, 2008 LL Bean 3.0R and 2017 Honda Civic Hatchback Sport Touring
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I had a similar problem with my 2000 and I replaced the rear brake caliper slides. You may be able to get away with just re-greasing them. While you're there, check your pads. Sometimes the inside ones wear a bit faster than the outside and you can't see them while the wheels are on. Perhaps one of the low pad indicators is touching the rotor on the inside.
 
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