California CDL Air Brakes Test

What is the role of the wig-wag (mechanical low-pressure warning device) in some older trucks?

A coupling for trailer lines A spring-loaded mechanical arm that drops into the driver's view when air pressure drops into California low-air warning range A type of slack adjuster A type of brake drum

Correct Answer:

A spring-loaded mechanical arm that drops into the driver's view when air pressure drops into California low-air warning range

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