CDL Air Brakes Test 5 – Classic Mode

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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