Ok, this is me - viewtopic.php?t=4738
First, I watched this thread with horror last year when a lot of folks on here jumped on Jillianne for not having an adequate explanation for them the failure and that the video from South Korea wasn't valid because it was an ICE car. That kinda bummed me out that some of you would invalidate her experience like that.
So I had the same issue, linked above. What the dealer told me was that the master cylinder pressure switch had ruptured AND the brake master cylinder had failed
. They replaced both and said they pressure tested them. So this failure could certainly happen in an ICE car without regen braking.
I embarked on a long research process of searching the NHTSA's database for reports of brake failure for the Spark EV and other EV and ICE GM cars that share the same brake system. I found plenty of them. I also tried looking through the Fatality Reporting System, and while there were fatalities, quite often in the absence of a survivor it appears like it's hard to say more than "the car went off the road and hit a tree and everyone died."
I was unsuccessful getting either the dealer, Wentworth Chevy, or the GM executive team to take any responsibility or buy back the car. They all said "we don't buy back cars, but hey if you want a NEW Chevy we'd be happy to buy your Spark back and lease you a new one!" The dealer also refused to provide any of the paperwork about the half-a-dozen times I brought my car in for the parking brake locking up one of the rear wheels and causing the wheel to get red hot and the car to vibrate heavily.
So I just waited out the last 6 months of my lease and returned the POS.
So my advice is to e-mail all of the executives at GM directly and someone from their team will get back to you. Good luck.