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It's computer controlled, so you can have it activated by brake pedal, or whenever your throttle is off. I think the intended control is activated when the throttle is off, but with a switch to deactivate it once you come to a complete stop (so it doesn't burn itself up). From what I've read...

I'm just tossing this one out there, because I haven't researched it a lot, but the new fire engines my employer just bought are equipped with jake brakes and a nifty device called a Telma retarder. Between the two, you can almost stop the truck without touching the brakes. The Telma retarder...