CDL Air Brakes Test 7 – Classic Mode

This is CDL Air Brakes Test 7 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. Modern air brake systems combines three different systems. The are the service brakes, the parking brakes and the:

A S-cam brakes.
B Drum brakes.
C Foot brakes.
D Emergency brakes.

2. Oil and water usually collect in compressed air tanks. If you do not have an automatic tank drain, when should you drain the air tanks?

A After every working day.
B After every four hours of service.
C Once a week.
D Every other week.

3. Why drain water from the compressed air tanks?

A To keep from fouling the air compressor oil.
B Water can freeze in cold weather and cause brake failure.
C The low boiling point of water reduces braking power.
D Water over cools the compressor.

4. Air brake equipped vehicles must have:

A A supply pressure gauge.
B An air use gauge.
C At least two brake heaters.
D A backup hydraulic system.

5. What can legally hold a parking or emergency brake in position for a truck, truck tractor or bus?

A Fluid pressure
B Air pressure
C Spring pressure
D Any of the above

6. Which of the following makes the total stopping distance for air brakes longer than that for hydraulic brakes.

A Brake lag distance.
B Action distance.
C Perception distance.
D Effective braking distance.

7. Of the choices below, the first thing to do when a low air pressure warning comes on is:

A Open the air supply control valve.
B Adjust the brake pedal for more travel.
C Stop and safely park as soon as possible.
D Up-shift.

8. The braking power of the spring brakes:

A Can only be tested by highly trained brake service people.
B Depends on the adjustment of the service brakes.
C Increases when the service brakes are hot.
D Is not affected by the condition of the service brakes.

9. The air compressor governor controls:

A When air is pumped into the air tanks.
B Air pressure applied to the brakes.
C The speed of the air compressor.
D When the brake chambers release pressure.

10. The application pressure gauge shows the driver how much pressure:

A Has been used on the trip.
B Is in the air tanks.
C None of these.
D Is being applied to the brakes.

End of Test #7

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