The passenger back tire/assembly is making an odd noise.
Unfortunately there can be a variety of reasons as to why your Cadillac is experiencing noises in the wheel area. With the information provided being a bit limited, I would recommend enlisting the assistance of a certified mechanic, such as one from YourMechanic, to come by and perform a test drive and visually inspect your suspension system. They will be able to quickly identify the odd noise and assist in making the repairs needed to keep your Cadillac driving like a luxury car should.
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