Hi,
What I suspect is happening is this: On the rear brakes, the backing plate has a sliding surface which the brake shoe touches. Those points get dry, rusty, and dirty from normal use. As a result, you will actually hear a squeaking sound when apply and release the brakes.
What needs to be done is this. The brake shoes and hardware should be removed and the slide surfaces should be cleaned and lubricated with brake grease. What I have done is provide the directions for replacing the rear brakes. I highlighted the section where it indicates lubricating the sliding surfaces.
The directions are for brake shoe replacement. However, you will need to remove and replace them regardless if you replace the shoes.
I hope this helps. Let me know if you have other questions.
Take care,
Joe
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Tuesday, August 17th, 2021 AT 9:51 PM