One problem related to brake grinding noise has been reported for the 2015 Chevrolet Suburban. The most recently reported issues are listed below.
My 2015 Suburban with approx 80k miles, started having brake problems when I would drive in reverse. The brakes had a grinding noise and was getting hard to press. The brake pads were replaced around 46k miles as I bought the vehicle used from enterprise sales. The brakes eventually got worse and had the brake assist message on dash come up. If I had to use the brakes too many times at ine time like if I had to go over speed bumps in my neighborhood, then the brakes would be extremely hard and would lose all power brakes. If I kept the vacuum up with a little rpm's- one foot on the brake and one on the gas, then I could get the power brakes to work. Now it's just totally gone. No power brakes at all now and ordered the vacuum booster and will replace it myself. I called the main Chevrolet hotline and they were totally worthless. I told them about all the numerous complaints popping up on the internet and with Suburbans with much less miles than mine and tried to see if they had any recalls regarding the brakes. They said no. I said they should be concerned before it ends up killing someone.