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Q: Squeak on 1995 BMW 740i

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I have an annoying squeak (almost bird-like chirping) coming the the back seat area of my '95 740i. I've looked around but haven't been able to locate the source of the squeak. Any thoughts?
(2) Answers
May be the brake pad wear sensor beginning to hit your brake rotor, some brake pads come with a thin metal tab that hits the rotor and make a chirping sound warning you that your brake pads need replacement
I have same car that had the same problem when I was idled at a stop light,etc...It turned out that a small bolt to the muffler hanger that secured the hanger against the chasis somehow vibrated loose. The problem was cured after the bolt was tightened/replaced--hope this helps :)
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