I last drove my A220 about 5 days ago. It's been sitting (on level ground) in my garage. I went to back out today and after I put the car in reverse nothing happened. I was expecting the car to idle its way backwards. I had to push the gas and then the rear brakes made a loud noise as if they had been stuck together.
The brakes seemed to work ok after that but I've never seen a car do this before. Anyone notice this or seen this before in Mercedes?

I took my car in to the dealer and they said this is normal. The brakes can form condensation, which after the emergency brake has been applied for a while, make the "breaking" noise when trying to disengage the brakes after they've sat for a while. Similarly, they said it's normal to hear the grinding until the "condensation" is worn off.

They had to swap my battery so I had a loaner for a day. I didn't notice it as bad but it was similar to what my car is doing so I'll assume the above is true.

yep mine does the same thing

Experienced safety issues and embarrassingly unimaginably loud brakes within weeks of getting this new. Within two weeks of the dealership being made notified, we finally found out there was a break recall. Had to wait 6 more months before getting replacement brakes put on. Car was in the shop more than two months within the first 7 of buying it and no compensation was offered or received.