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Over run was done by a fuel govenor that shut off fuel progressively that faster it turned. Doesn't really stop overrun, particularly downhill.
Two systems for power add-ons: vacuum or hydraulic. Brakes, steering on a F250 are from the steering pump , AC selection is vacuum, but my schoolbus had a pot load of vacuum powered stuff so it had a pump.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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