how semi truck trailers don’t just roll away when disconnected from a semi truck
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The brakes on the trailer are fail-safe – meaning that if they lose air pressure from the truck, the brakes on the trailer default to locked. This prevents the trailer from rolling but also prevents the driver from continuing to pull the trailer without good air pressure.
You can see this sometimes on the show Ice Road Truckers – if they get a little moisture in the air lines and it freezes, the trailer becomes immobilized until its fixed.
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