Air Brakes CDL Test - FREE West Virginia CDL Practice Test

1. Spring brakes are usually held back by:

2. If a vehicle is equipped with ABS, when you start the engine:

the spring brakes will come on.
the trailer emergency brakes will come on.
the ABS indicator light on the dash should come on and then turn off.
the wheels will lock up.

3. If your truck has automatic transmission, you should downshift:

after entering a curve.
whenever road conditions allow.
when you need to accelerate.
when going down grades.

4. In a vehicle with a dual air brake system:

both systems typically operate the regular brakes on the rear axle.
each system has its own air tanks.
one system supplies air to the trailer.
All of the above.

5. Empty trucks require _____ stopping distances because empty vehicles have ______ traction.

6. Which of the following can cause brakes to fade or fail?

Brakes out of adjustment
Not relying on the engine braking effect
Excessive use of the service brakes
All of the above.

7. Air tank drains:

are used to move air to the brakes.
are used to remove water and oil from the air tanks.
protect the tanks and the rest of the system from too much pressure.
should not be used in wet weather.

8. Typically an air system is fully-charged at:

9. Older trailers do not have spring brakes. If the air supply leaks away:

there will be no emergency brakes.
the trailer will stop normally.
the ABS won't work properly.
All of the above.

10. The safety relief valve is located:

on each end of the vehicle's axles.
in the first tank the air compressor pumps air to.
on the dashboard.
in the front brake.

WV CDL AIR BRAKES PRACTICE TEST