Forward collision avoidance; automatic emergency braking; adaptive cruise control; I pulled into a straight-ahead handicapped parking slot to park, going about 1-3mph . There was a handicapped sign in front of me on a newly installed steel pole. I pulled in within inches of the pole. When I tried to engage the brakes, the braking system failed to engage the brakes and slow down the car. The car instead accelerated and would have broken through a store front had the pole not stopped it. I also pushed on the brakes, but nothing happened, the car did not seem to slow down at all, like I had no brakes. It's like the brakes did not work and the automatic braking did not work either. There was a complete system brake failure. Also, the air bags did not deploy, which I'm surprised with so much front end damage to my car. So, in a panic to stop the forward acceleration, I put the car in reverse; after which the vehicle accelerated in reverse out of my control and crashed into a 3-foot concrete wall and another vehicle next to the wall. This crash stopped the vehicle. I had no control over speed of the acceleration, steering of the vehicle, or stopping. I am concerned about a defect in the brakes and the PKBS braking system. I could have been killed or backed into another person or car killing someone else. The car has been repaired. I did receive a msg about the raider cruise system being on days prior; I didn't know what it meant; it went away and I did not pursue why cruise co