CDL Air Brakes Test 5 – Classic Mode

This is CDL Air Brakes Test 5 in our original Classic Mode. Simply click in your answer to each CDL practice test question. When you're finished, check your score and results. You can reset the test and retake it as needed.

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1. If your vehicle has an alcohol evaporator, every day during cold weather you should:

A Clean the air filter with alcohol.
B Check and fill the alcohol level.
C Change the alcohol from a new bottle.
D Check the oil for alcohol content.

2. During normal driving, spring brakes are usually held back by:

A Spring pressure
B Bolts or clamps
C Centrifugal force
D Air pressure

3. Air braking takes more time than hydraulic braking because air brakes:

A Need to have airflow through the lines to work.
B Use different brake drums.
C Require heavier return springs.
D All of the above.

4. In air brake vehicles, the parking brakes should be used:

A To hold your speed when going downhill.
B Whenever the vehicle is parked.
C As little as possible.
D Only during pre and post trip inspections.

5. The brake pedal in an air brake system:

A Is to be used as a footrest during normal driving.
B Controls the speed of the air compressor.
C Controls the air pressure applied to put on the brakes.
D Is connected to slack adjusters by a series of rods and linkages.

6. If your truck or bus has dual parking control valves it means that you can use pressure from a separate tank to:

A Balance the service brake system.
B Release the spring brakes to move a short distance.
C Stay parked without using up service air pressure.
D Apply more brake pressure if the main tank is getting low.

7. A straight truck or bus air brake system should not leak at a rate of more than ____ PSI per minute with the engine off and the brakes released.

A 4
B 3
C 2
D 1

8. If your vehicle has an alcohol evaporator, it is there to:

A Reduce the risk of ice in air brake valves in cold weather.
B Eliminate the need for daily tank draining.
C Rid the wet tank of alcohol that condenses and sits at the bottom.
D Boost tank pressure the same way that superchargers boost.

9. If you must make an emergency stop, you should brake so that you:

A Use the full power of the brakes and lock them.
B Can steer hard while braking hard.
C Stay in a straight line and can steer.
D Use the hand brake first.

10. 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?

A Reduce your speed and drive to the nearest garage for repairs.
B Continue at normal speed and find a garage before the brakes lock.
C Reduce your speed and test the remaining system while under way.
D Stop. Safely park, and continue only after the system is fixed.

End of Test #5

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