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Question:

What is the best way to test your vehicle's low air pressure warning signal?

Answer: Step on and off the brake pedal with the engine off to reduce air pressure below 60 psi.

Explanation
The best way to test the low air pressure warning signal is to turn off the engine of your vehicle while leaving the electric on, then step on and off your brake pedal. The low pressure warning signal should come up when you reduce pressure below 60 psi. You should not need to get down to 30 psi ever.
This question is in Section 3: Air Brake of our CDL Test Guide. Explore now!
Related Question

Question: The aggregate working load limit of your cargo tiedowns must be at least ______ times the weight of the cargo.

one-half

Federal Motor Carrier Safety Regulations Part 393.106, issued by the Federal Motor Carrier Safety Administration (FMCSA), requires the aggregate working load limit of any securement system used to secure an article or group of articles against movement to be at least one-half times the weight of the article or group of articles.

Question: If testing your hydraulic brakes for leaks, you should…

Pump the brakes 3 times, then apply pressure for 5 seconds

When testing your hydraulic brakes, you want to pump the brakes three times. At that point, you should then hold the pedal down with firm pressure for five seconds. If it moves at all, it is possible that the brakes have a leak or other problem.

Question: Why should you keep any hazardous material shipping paper on view in the cab at all times?

So emergency services can easily find it

Always have hazmat shipping papers in plain view, even when you’re not in the vehicle. If there is an accident and you are unconscious, emergency services will need to know exactly what is in your load. Even if away from the truck (for example eating), leave the paperwork somewhere easily accessible in case there should be an incident.

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It can only be paid off by sleeping.

Question: The S-cam:

Forces the brake shoes against the inside of the brake drum.

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