If It’s the master cylinder hitting, it’s an occasional headache. Just haven’t heard of it in a while.
We’ve had to suggest putting washers under the master to give it an angle.
Or maybe it wasn’t a master cylinder, but instead was the mounting bracket itself against the firewall. That’s probably it. Washers under the upper bolts.
I wonder if it was always the same brand? Or if it could happen to anybody?
Since we all know that Broncos aren’t the most consistently built vehicles in the first place, perhaps there’s the occasional misplaced hole in a firewall.