CDL Knowledge Quiz for Retired Truckers — How High Can You Score?

What’s the main purpose of the air brake warning light?

20%

Correct!

Incorrect!

The air brake light means your system’s pressure is dropping. If it comes on, stop immediately — driving further could mean total brake failure.

Reminds you to check the horn

Measures brake temperature

Warns of low air pressure

Turns on during night driving

20%