MLA Citation: Bloomfield, Louis A. "Question 166"
How Everything Works 20 Apr 2018. 20 Apr 2018 <http://howeverythingworks.org/print1.php?QNum=166>.
166. Why do many buses use air brakes instead of hydraulic brakes?
As you have noticed, buses, trucks, and trains often use air as the hydraulic fluid in their braking systems. That's because air is cheap and non-toxic, so that spilling it isn't a problem. While air's compressibility makes it a bit more complicated to work with than a liquid hydraulic fluid, it still works well in power braking systems.

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