All things considered, maybe there were things you could have done better but in the end unexpectedly rolling down a hill backwards when you're already hitting brakes , in my view, using a tree to stop is still on the list of reasonable options to get stopped.
I do believe you probably lost all your vacuum boost, it's hard to say from there if you could have put enough pressure even with two feet on the brake to get stopped, we'll never really know, after that first jostle it's possible your foot wasn't even on the brake at all anymore.
Maybe, maybe ABS got confused, but if you were in 4L i think some traction features are limited if i recall. I think most reasonable explanation is lack of boost and enough foot power in the moment.
Edit:
just to try, I have a driveway with a 25+ degree slope. Shutting off the engine and rolling downhill forward I got maybe 3 good pumps of the brake with boost on the 4th the pedal got stiff and I had to to put a significant amount of pressure on the brake to come to a stop. I could see reverse being even more challenging. Also, having stalled on the trails a few times I’ve found the assisted restart is pretty quick, even some pressure on the clutch will get that starter moving.
I will say after rewatching the video it does somewhat look like you were possibly gassing in reverse. It wouldn’t be impossible to go from crawl to reverse by accident, I’ve done this once myself.
With all that said, I do believe if this vehicle had a manual pull cable E-brake much of what happens could have been prevented. This is hands down my biggest complaint about the manual bronco.
I do believe you probably lost all your vacuum boost, it's hard to say from there if you could have put enough pressure even with two feet on the brake to get stopped, we'll never really know, after that first jostle it's possible your foot wasn't even on the brake at all anymore.
Maybe, maybe ABS got confused, but if you were in 4L i think some traction features are limited if i recall. I think most reasonable explanation is lack of boost and enough foot power in the moment.
Edit:
just to try, I have a driveway with a 25+ degree slope. Shutting off the engine and rolling downhill forward I got maybe 3 good pumps of the brake with boost on the 4th the pedal got stiff and I had to to put a significant amount of pressure on the brake to come to a stop. I could see reverse being even more challenging. Also, having stalled on the trails a few times I’ve found the assisted restart is pretty quick, even some pressure on the clutch will get that starter moving.
I will say after rewatching the video it does somewhat look like you were possibly gassing in reverse. It wouldn’t be impossible to go from crawl to reverse by accident, I’ve done this once myself.
With all that said, I do believe if this vehicle had a manual pull cable E-brake much of what happens could have been prevented. This is hands down my biggest complaint about the manual bronco.
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