1992 300D

While I am rotating the steering wheel, with gear in D and brake pedal pressed, the rear wheel rotates a few degree.
In that time, I hear grinding noise from rear wheel.

If I do this with gear in N, or brake pedal not pressed, I do not hear the grinding noise.

Is this normal in MB diesels due to high torque engine?

Rear brake rotors are only 1 month old. The mechanic sain the rear brake pads are still OK. (The rotors were replaced during parking brake job.)