Air brakes are the brakes on large vehicles. They use air pressure for their power.
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Buses and trucks need to be cautious when going down long, steep hills. If they ride the brakes too much, the air pressure in the brake system may drop. If the air pressure gets too low, the drivers may end up with no brakes at all. Then they would really be testing their "air brakes."
101 American English Riddles: Understanding Language and Culture Through Humour
Author: Harry Coollis
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