Air Brakes CDL Test - FREE Pennsylvania CDL Practice Test

1. The use of air brakes on a steep downgrade is only a supplement to:

the use of the parking brakes.
the use of the spring brakes.
the braking effect of the engine.
the use of the "controlled braking" method.

2. Before driving a truck or bus with a dual air brake system, the minimum pressure in both the primary and secondary systems should be at least:

3. If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.

4. It is not safe to drive a vehicle that has brake drums with cracks that are longer than ___ the width of the friction area.

5. Weight that is loaded so there is a high center of gravity:

causes greater chance of rollover.
makes a vehicle easier to handle.
reduces the chance that the load will shift to the side or fall off.
All of the above.

6. What should you do to correct a drive-wheel braking skid?

Fully apply the brakes, turn the steering wheel quickly, push in the clutch, and countersteer.
Turn in the same direction as the skid.
Stop braking, turn the steering wheel quickly, push in the clutch, and countersteer.
None of the above.

7. Brakes out of adjustment can cause the other brakes to:

8. If your vehicle does not have automatic air tank drains, how often should you drain air tanks to remove moisture and oil?

9. The parking brake:

should be used whenever you park.
should be used when driving in bad weather.
should be used when you need to apply the brakes firmly.
All of the above.

10. The alcohol evaporator:

eliminates the need for daily air tank drainage.
helps to reduce the risk of ice in air brake valves and other parts in cold weather.
ensures the coolant temperature gauge remains in the normal range.
shows how much air pressure you are applying to the brakes.

PA CDL AIR BRAKES PRACTICE TEST