On the 60's Chevy single axle dump. I can vaguely remember there being some sort of canister under the frame.
This looked to be more of a vacuum reservoir, judging from the plumbing array.
Been about 18 years & several general anesthesia , so mental details are pretty faded now.
Funny thing was, the brakes had a decent feeling firm pedal
when the truck was running.
Didn't try to steer when you applied them and seemed to hold without any pedal creep, when sitting at a stop.
They just went away whenever the motor wasn't running.
Weird huh.
If they had felt mushy or the pedal crept down while holding,
I wouldn't have driven the truck a second time.
Further conversation revealed the brakes weren't quite at a factory configuration.
Something was purported as unobtainium and this setup what what someone had arraigned.
Bottom line? I haven't driven anything since, that I haven't hit the brake pedal first.
Combined with end of the day fatigue,
I guess that my old habit of foot on the clutch and the other on the throttle (with manual chokes) is what got me into trouble that day.
Motorcycles, bicycles, go-carts, lawnmowers, anything else I had always habitually hit the brakes before ever rolling away.
I just 99% failed the Darwin test that day.