Was rolling in reverse out of a parking spot. Went to apply the brakes and the brake pedal went to the floor. I pumped the brakes but this had no effect on stopping the car. I panicked and shifted into park. After a few minutes I tried again and the brakes worked. We took the car to the dealership. Paid $168.00 and was told there is nothing wrong with the brakes. There are roughly 37,000 miles on this 2017 Altima. Very unsettling as something is definitely wrong and I worry about it happening again.