I have noticed a low speed grinding type noise through the steering column of my '92 500E, 61k miles. Noise only occurs below 40 mph and goes away when I apply the brakes.
If I gently ride the brakes the noise goes away as well. I know that these cars have a reputation for dodgy brakes and my early production (late '91) car has the original brakes. The pads are fine, I know, because the car just went through its major 60k mile service.
Any similar experiences?