Squeaking braking in reverse

[95escahoe]

So this past week I had new rims put on and had the window down and noticed when I brake in reverse there's a squeaking sound, doesn't do it driving around, not sure how long its been doing it for checked the rims don't see anything hitting, any ideas? Maybe the self adjusters? And brakes all around have been done in the last 2.5 years the rears being the last done, thanks for the help




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