I had an old Jeep CJ3A. 3 of us were sailing across the desert and came to a short but steep hill with a dry creek at the bottom. I pushed the brake and SQUISH, it went to the floor. I hit the bottom doing about 25 or 30. The guy in back came over the roll bar, hitting his head on the way, and ended up with his head between the front seats. He just had a cut on his head, luckily. That could have been nasty.
A brake line had split. That was before dual master cylinders were invented.
