Braking Systems: Air Brake System Checks and Emergency Procedures

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Build confidence with 10 original questions about Braking Systems: Air Brake System Checks and Emergency Procedures. Review your answers and explanations after finishing.

Supplemental study practice. This is not a government licensing exam or ELDT certification, and does not replace hands-on training. Follow your state’s current handbook.

1 / 10

During your pre-trip inspection, you notice an air hose connected to a brake chamber is worn from rubbing. What should you do?

Continue driving and monitor the hose during your trip

Have the hose repaired or replaced before driving

Reduce your speed and proceed with caution

Wrap the hose with tape as a temporary fix

2 / 10

You are about to descend a long, steep grade. What should you do to help prevent brake fade?

Turn off the engine brake to save fuel

Apply the service brakes continuously

Rely on engine braking and avoid overusing the service brakes

Use only the parking brake to slow down

3 / 10

During your walkaround inspection, you pull on a slack adjuster and it moves more than one inch where the push rod attaches. What is the correct action?

Adjust it or have it adjusted before driving

Ignore it if the brakes seem to work

Continue driving and check it at your next stop

Apply the parking brake and retest

4 / 10

If you are using the controlled braking method during an emergency stop and the wheels lock up, what should you do?

Pump the brakes rapidly

Release the brakes and reapply as soon as you can

Increase steering wheel movement to regain control

Hold the brakes firmly until the vehicle stops

5 / 10

If your vehicle has a dual parking control valve and you lose main air pressure, what should you keep in mind when using the separate air tank to release the spring brakes?

You must manually pump up the air pressure each time

You can only release the spring brakes a few times before the air supply runs out

You can use the separate air tank indefinitely

The spring brakes will not work at all

6 / 10

You are parking a vehicle with air brakes. What is the correct way to apply the parking brakes using the control knob?

Pull out the diamond-shaped, yellow push-pull knob

Push in the knob and press the brake pedal

Pull out the red knob labeled 'trailer air supply'

Turn the knob clockwise until it locks

7 / 10

When testing the low air pressure warning signal, at what air pressure must the warning signal activate?

Exactly at 70 psi

After the pressure falls below 45 psi

Only when the pressure reaches zero

Before the pressure drops below 55 psi

8 / 10

If you are driving a vehicle with ABS and the yellow ABS malfunction lamp stays on after the bulb check, what does this mean?

The brakes will not work at all

You may have lost ABS control at one or more wheels

The ABS is functioning normally

You must stop immediately and call for a tow

9 / 10

While performing a final air brake check, you fully apply the foot brake in a single vehicle with a fully charged air system. If the air pressure drops more than three psi in one minute, what should you do?

Check for air leaks and repair the system before driving

Drive slowly to the nearest repair shop without stopping

Ignore the result if the brakes feel normal

Add more air to the system and retest

10 / 10

Before driving a vehicle with a dual air brake system, what should you confirm about the air pressure gauges?

Both the primary and secondary air pressure gauges show at least 100 psi

Only the primary air pressure gauge shows at least 55 psi

The gauges both read zero before starting the engine

Only the secondary gauge needs to show pressure above 80 psi

Your score is

The average score is 0%

About the Braking Systems: Air Brake System Checks and Emergency Procedures practice quiz

This practice quiz focuses on Braking Systems: Air Brake System Checks and Emergency Procedures, listed under CDL Practice — Braking Systems. Use it to check what you understand, spot topics to revisit, and connect the material to safe, informed decisions on the road.

Before you begin

Keep your current CDL manual or course notes nearby. Read each prompt carefully and think through why an answer fits, especially when a question describes a vehicle, road, or workplace situation. Licensing rules and procedures can vary, so confirm requirements with current official materials for your state.

After you finish

Review any explanations shown with your results. Note unfamiliar terms or missed concepts, then revisit your manual or course notes before trying again. Use your score to guide study; understanding why an answer is correct matters more than the number alone.

Study note: These quizzes are independent study practice. They are not state licensing exams, official government materials, or ELDT certification, and they do not replace required training.

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