Air Brakes Test Oregon (2024) - FREE CDL Practice Test

1. You must take the CDL skills tests in the type of vehicle for which you wish to be licensed. If your test vehicle does not have air brakes:

you will be restricted to driving vehicles without air brakes.
you'll have to immediately retake your test using another vehicle.
you'll need to take another knowledge test about air brakes.
you won't receive a CDL.

2. You should drain the air tanks completely. If water and oil collect in the air tanks:

your brakes could become hard to press.
your brakes could fail.
your brakes could heat up.
None of the above.

3. If your ABS malfunctions:

you should immediately come to a complete stop.
the service brake will not work.
the parking brakes will not work.
you still have normal brake functions.

4. When should you be particularly careful about high winds?

5. Which of the following is NOT TRUE? When you drive a tractor-trailer combination with ABS, you should:

use only the braking force necessary to stop safely.
monitor your tractor and trailer as you slow down, and if it is safe to do so, back off the brakes to stay in control.
drive slower to keep your vehicle in a straight line.
brake the same way, regardless of whether you have ABS on the tractor, the trailer, or both.

6. To check the slack adjusters:

Park on level ground and chock the wheels, release the parking brakes and pull hard on each slack adjuster. The slack adjuster shouldn't move more than one inch.
park downhill and see if the vehicle rolls.
check the air hoses connected to the brake chambers to make sure they aren't cut or worn.
None of the above.

7. Some air brake systems have an alcohol evaporator to:

reduce the stopping power of the vehicle.
prevent ice from forming in the brake system.
force the brake shoes away from one another.
reduce the danger of slipping.

8. Most heavy-duty vehicles use:

9. The air compressor is connected to:

10. Which of the following is not a type of retarder?

AIR BRAKES CDL PRACTICE TEST - OREGON