King of the Highway: The Ultimate Big Rig & Semi-Truck Operations Challenge
At what minimum air pressure must a big rig low-air warning light turn on?
5%
Correct!
Incorrect!
By federal safety regulations (FMVSS 121), dual air brake systems must trigger a visible and audible warning buzzer/light to warn the driver before pressure drops below 60 PSI in either reservoir.
At what minimum air pressure must a big rig low-air warning light turn on?
Exactly 120 PSI
Around 60 PSI
Under 20 PSI
Exactly 90 PSI
5%
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