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

1. Brake fade results from, and is affected by:

excessive heat caused by using the brakes too much.
brakes out of adjustment.
All of the above.

2. If you are being tailgated, you should:

speed up.
increase your following distance.
move to the left lane.

3. The most common type of brake is the:

4. Axle weight is:

the weight of all the axles added together.
the weight transmitted to the ground by one axle or one set of axles.
the maximum safe weight your tires can carry at a specified pressure.

5. On a tractor-trailer equipped with a trailer brake hand valve, the hand valve can be used to:

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

the braking effect of the engine.
the use of the parking brakes.
the use of the spring brakes.

7. Which of the following is not a braking system on a truck?

8. Why should you check your mirrors regularly to know where other vehicles are around you?

To move out of their way if they want to get past.
To know whether you can make a quick lane change in an emergency.
To flash the brake lights if you are being tailgated.

9. Having ABS on only the trailer:

still gives you more control over your vehicle during braking.
makes the trailer more likely to swing out.
is very dangerous.

10. To make the brakes work, air brakes use:

OKLAHOMA CDL AIR BRAKES PRACTICE TEST