Brake Master Cylinder problems of the 2017 Cadillac XT5

On March 23 we took our 2017 Cadillac Xt5 to the dealership for a service because 2 days prior, the parking brake would not release while in a stationary position. We were able to release the parking brake after turning the vehicle on and off multiple times. All of the warning lights on the dash came on, but the brake released and was able to be driven home. The vehicle was ready to be picked up the following day. They had replaced the parking brake actuator and stated that it was the cause of the issue. The vehicle seemed to be running normally for us and continued to do so until the morning of April 9th. My wife was just leaving work that morning and started driving the car home when she approached a stop light and the brake pedal went to the floor, the vehicle was not able to be slowed or stopped. She was able to safely go through the red light and turn into a parking lot where the vehicle rolled into a parking stall. If she had made it through the light on green, she would have been on the freeway. There was a grand total of 108 additional miles since the last service on March 23. The vehicle was towed back to the dealership where they had it for almost a week. They found that the master cylinder had been leaking into the booster which caused the fail. The brake booster and master cylinder were both replaced. After additional research, I have found multiple people have had the same/similar issues with their vehicle. It appears that all of the warning lights coming on at the same time may have been a sign that the master cylinder was failing.

Brake master cylinder failure - brake fluid error message appeared on screen and over the course of 24 hours the brakes stopped working. While pushing the peddle completely flush to the floor, the vehicle hardly stopped. Had the car towed to the dealership for repair.