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

1. Before starting down a hill, you should slow down and shift down:

to a gear that will cause your engine to exceed its redline.
to a gear that will cause your brakes to overheat.
to a speed that you can control without using the brakes hard.
so you can coast downhill.

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

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

3. Why must air tanks be drained?

Your transmission fluid may drain out.
There might not be enough antifreeze in the system.
The alcohol evaporator might stop working.
The water can freeze in cold weather and cause brake failure.

4. The safety valve is usually set to open at:

5. To apply the parking brakes:

place the parking brake control knob in Neutral.
pull the parking brake control knob out.
push the brake pedal three times.
push the parking brake control knob in.

6. What factors can cause brakes to fade or fail?

Overheating, low air pressure or water in the air tanks.
Going too slow.
Not taking your foot off the accelerator.
Not pressing the brake pedal hard enough.

7. Rough acceleration:

improves gas mileage.
can cause mechanical damage.
is necessary to warm up the engine.
is recommended during long trips.

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

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

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

10. Which of the following is NOT a reason for hydraulic brake failure?

AIR BRAKES CDL PRACTICE TEST - WYOMING