Cliff notes? Pushrod fell out? Brakes just didn't work right? Billy Bob designed the system? Couldn't get it bled? Looked like a lawn sprinkler when he pushed the pedal?
I wondered about that too, but I haven't seen a definitive explanation. He did a follow-up video where he took questions from the audience, and he talked about it maybe being the brakes being over heated (from riding them) and boiling the brake fluid.
When I watched the crash video, it seems like the driver has his foot go to the floor when he's hitting the brakes.. not just unresponsive brakes that took more effort that usual. I think that's why the boiling brake fluid explanation makes sense to me.
