general problems of the 2006 Hyundai Tiburon

I was in fairly heavy traffic traveling 65-70 mph and another car swerved in front after passing me (on the right) and when I went to apply brakes they went to the floor and the car started to accelerate. I again applied brakes and not only did they not work they also didn't disengage the cruise control. I started to panic and applied the clutch and tried to downshift. I had seconds to respond and a gap in traffic behind me so I needed to get over to right shoulder as quick as possible (I was in the left lane) I put the car in neutral and started to apply the hand-brake slowly at first. As I entered the right lane and neared the shoulder (out of traffic) I applied the hand brake as hard as I could and simultaneously turned off the ignition when the car had slowed enough. I should also mention that upon coming to a stop the check engine light was solid and stayed on even after shutting down and restarting the car. It remained on until I got the car to the nearest dealer. I'm ok and it could have been much worse (no damage to me or car) but the dealer who serviced the car told me they confirmed that the computer was sending erroneous codes to multiple systems at once. I have their report and the documentation on the software update they applied to the cars computer. They didn't replace the computer just the software! this could have been much worse in another situation. It was scary as hell and im still somewhat shaken. I'd rather be proactive about bringing attention to this than ignoring the incident and the fact remains that I have no idea if the new software patch that the dealer applied to the computer is able to protect my safety.