Sometimes when a brake job is done, the replacement pad sensors are left out of the job. This results in the pads wearing down without any indicator light coming on.
You should pull off that wheel and check both the inner and outer pads for wear. And you may be able to turn the wheel around and repeat the noise.
So, you may be looking at just pads, or maybe pads and rotors.
Just my guess.......
Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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