Identifying brake related noise when slowly letting it off

Question

I got a brand new car for the first time. It's an automatic transmission. So far so good except for some noises I'm hearing.

When putting the car into reverse, slowly letting go of the brakes makes this low hollow sound for a second. It's almost like if you step on a creaking hardwood floor. If I let go of the brake very quickly, the sound is minimized. At 1:47, as he's letting go of the brakes, you can hear the same noise. https://youtu.be/KI7jvt-s_E4?t=102. I know it should probably be normal since this video captures it also (unless that car is also faulty), but I'd like to get rid of it if possible.
When I switch to reverse, there's a subtle jerk feel/sound. Is this normal?

Solar Mike · Answer

For 1) if you slowly release the brakes then they can "drag" on the disks for longer and as the disks start to rotate, either through grade or suspension load, then you hear the sound caused by friction.
For 2) as you select reverse, then the drive train, being an automatic is being loaded into turning the opposite direction which will absorb all the free play. On a manual this would only happen as you lift the clutch and if you were a manual driver before you have accustomed yourself to this.

Identifying brake related noise when slowly letting it off

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