Free Air Brake CDL Practice Test

Master the Air Brake System & Pass Your Exam

Are you ready to pass your CDL Air Brake Endorsement exam? Our free Air Brake CDL practice test features real-world questions to help you understand air brake systems, safety procedures, and regulatory requirements. Test your knowledge and prepare to ace your CDL exam on the first attempt!

The braking power of the spring brakes:(Required)

Increases when the service brakes are hot.

Depends on the service brakes being in adjustment.

Is not affected by the condition of the service brakes.

During normal driving, spring brakes are usually held back by:(Required)

Spring Pressure

Air pressure

Bolts or Clamps

Your truck has a dual air system and one of the system loses its pressure. What will happen?(Required)

Brake drums will not be fully pressurized.

Either the front or back brake will not be fully operational.

The manual slack adjusters of the S-cam brakes will not be set properly.

If your truck has a properly functioning dual air brake system and minimum size air tanks, the air pressure should build up from 85 to 100 psi witihin how many seconds?(Required)

How should you check that your service brakes are working properly?(Required)

Park on slight grade, drain off air pressure, set parking brake and check the movement.

Park on a level ground, chock the wheels, engage the parking brakes when you have the correct amount of air pressure to do so and shut the engine off.

Park on level ground, wait until normal air pressure is reached, release the parking brake and move forward slowly at about 5 mph. Then apply the brakes firmly.

If your vehicle has an alcohol evaporator, every day during cold weather you should:(Required)

Check the oil for alcohol content.

Change the alcohol from a new bottle.

Check and fill the alcohol level.

Some air brake systems have an alcohol evaporator. What may happen if you don't keep the proper level of an alcohol?(Required)

Ice may form in the air storage tank and cause a brake failure.

The S-cam may not take back when you release the brake pedal.

Ice may form on the brake drums and wear them out.

The air compressor stops pumping air at what psi?(Required)

100

125

150

If you must make an emergency stop, you should brake so you:(Required)

Use the full power of the brakes to lock them.

Can steer and so your vehicle stays in a straight line.

Use the hand brake before the brake pedal.

The application pressure gauge shows how much air pressure you:(Required)

Have in a modulating control valve.

Are applying to the brakes.

Have in the air tanks.

The safety valve is set automatically when pressure is:(Required)

150

100

Your truck or bus has a dual brake system. If a low air pressure warning comes on for only one system, what should you do?(Required)

Reduce your speed and test the remaining system while under way.

Bring your vehicle to a complete stop right away and safely park. Continue only after the system is fixed.

Reduce your speed and drive to the nearest garage for repairs.

Excessive use of the service brakes results in overhearing which can lead to:(Required)

Expansion of the brake drums.

Proper adjustment of S-cam.

Increase contact between the brake drums and linings.

The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below _________ psi.(Required)

The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:(Required)

1 psi in 30 seconds.

2 psi in 45 seconds.

3 psi in one minute.

Why drain water from compressed air tanks?(Required)

Water low boiling point reduces braking power.

Water can freeze in cold weather and cause brake failure.

Water cools the compressor too much.

The most common type of foundation brake found on heavy vehicles is the:(Required)

Disc

S-Cam Drum

Wedge Drum

If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:(Required)

Release the spring emergency/parking brakes to move a short distance.

Stay parked twice as long without using up service air pressure.

Balance the service brake system when you are parked.

Parking or emergency brakes of trucks and buses can be legally held on by __________ pressure.(Required)

Air

Fluid

Spring

Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?(Required)

Stop right away and safely park. Continue only after the system is fixed.

Reduce your speed and drive to the nearest garage for repairs.

Reduce your speed and test the remaining system while under way.

The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below _______ psi.(Required)

100

A straight truck or bus air brake system should not leak at the rate of more than ___________ psi per minute with the engine off and the brakes released.(Required)

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Addison Classroom:

1250 W. Lake St, Addison, IL 60101

Driving Range:

1800 W Hawthorne Ln, West Chicago, IL 60185

Free Air Brake CDL Practice Test

Master the Air Brake System & Pass Your Exam

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