I have barely add my Tesla Model Y for 45 days and 3 times I have experienced sudden hard braking on the highway. The first time, we were on a curve and there was a semi in the lane on the right - so i attributed it to that. The second time there was no car around at all, and all of a sudden the car just brakes by itself --- jerky and scary!!! Fortunately there was no one behind us and we didn't get rear ended.
Yesterday, we were driving on the highway - at 74 mph - and it braked so hard all of a sudden by itself - my son and husband both screamed as to what was I doing. There was no car ahead or side of us but there was a car about 5 cars distance behind us and it had to swerve and move to the next lane - again, thankful that he moved and didn't hit us. After that, all sorts of warning messages started flashing/beeping on my screen :
a) Cruise Control Disabled
b) Automatic Vehicle Hold Disabled
c) Parking Brake Functions Degraded
d) Parking Brake Did Not Engage - vehicle may roll
I almost wanted to pullover to figure out but was a few minutes away from home and my family requested we go home. As I was pulling up on our sloped driveway - half on the road still, i stopped and put the car in Park (P) to let my family off and thought i would reverse and drive around and see whats going on.
And then, oh boy - the car won't move! If i tried changing to Drive (D) or Reverse (R), it would right away go back to Park (P)!!!!! And with the message that the Vehicle may roll, i was completely freaked out as I was on a slope.
Called Tesla Emergency - was on hold for 20 minutes at least - finally got someone on the line. Then we tried to do a hard reboot, and few other options but nothing worked. So he advised that the car needs to be towed as it has problems with its BRAKE!!!
I am so thankful that we had reached home safely - but am very concerned as 3 times we lucked out with this sudden braking - and this issue better get fixed NOW!