http://www.youtube.com/watch?v=mx_5DpLDc0Y
I thought air brakes would lock up in this situation. Don't they apply themselves when the engine is off and the air pressure runs out?
DukeOfUndersteer wrote: http://www.youtube.com/watch?v=mx_5DpLDc0Y
Too bad all the best part was just fuzzy closeups of gravel...
rustyvw wrote: I thought air brakes would lock up in this situation. Don't they apply themselves when the engine is off and the air pressure runs out?
The maxi-brakes will automatically come on if the brake release valve is pulled out or the system loses pressure. Me thinks that in this situation the driver rolled the truck and just got the hell out, without setting the brakes, thus allowing it to roll again once uprighted.
Or, the brakes were such toast that nothing was going to keep from rolling except chocks as mentioned.
Edit: the only truck that I've ever driven that the ignition had to be on for the brakes to release was a old International, a system like that isn't the norm.
That looked like a REALLY nasty mountain road. Switchbacks, steep, no guardrails. South American version of the Tail of the Dragon?
The school busses I have driven the brakes would lock whenever there was no air pressure. Sit and wait til pressure builds every morning. The old Bluebird took forever on cold mornings.
porksboy wrote: The school busses I have driven the brakes would lock whenever there was no air pressure. Sit and wait til pressure builds every morning. The old Bluebird took forever on cold mornings.
There a few Army trucks that are like that. Only they make a horribly annoying noise to let you know the air pressure isn't high enough.
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