how semi truck trailers don’t just roll away when disconnected from a semi truck
In: 8
Your Car breaks when force is applied via the break pedal, the break is open at rest.
So assuming your break pedal disappears you can’t break.
Trucks do it the other way.
The breaks are engaged while at rest (done by a big spring) and are only kept open by hydraulic or pneumatic pressure.
So when their “break pedal” disappears the breaks simply engage.
In Short:
Car uses force to engage breaks, they are naturally open.
Semis use force to keep them open, they are naturally closed.
With the trailer disengaged there is no force to keep the breaks open, they stay engaged.
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