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

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

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

2. With the air pressure built up to governor cutoff, the maximum leakage rates per minute are:

3 psi for single vehicles and 6 psi for a combination of 2 vehicles.
3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
5 psi for single vehicles and 6 psi for a combination of 2 vehicles.
2 psi for single vehicles and 3 psi for a combination of 2 vehicles.

3. Your truck has a dual air system. If either system is very low on pressure:

the ABS will not work properly.
the low pressure warning signal will stop working.
either the front or the rear brake will not be fully operational.
the tractor protection valve will not work properly.

4. When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?

if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
The air could leak out of the trailer air tank, releasing its emergency brakes.
You may not notice a major leak in the service line until you try to put the brakes on.
None of the above.

5. What should you do to test your vehicle's low air pressure warning signal?

Release the parking brake valve and the tractor protection valve and reduce the air pressure by stepping on and off the brake pedal.
With the key in the "on" or "battery charge" position, rapidly apply and release the foot brake.
With the engine running, put the vehicle in a forward gear and attempt to drive forward.
Pump the brakes until the air pressure drops below 80 psi.

6. A low air pressure warning signal is required on:

Warning signals are optional.
all vehicles with air brakes built after 2005.
all vehicles with air brakes.
all vehicles with air brakes built after 2009.

7. Vehicles with air brakes require more stopping distance than vehicles with hydraulic brakes. Why?

When driving vehicles with air brakes, the average perception distance increases from 400 feet to 2200 feet.
Stopping distance for vehicles with air brakes is made up of six different factors.
Air brakes use different brake drums.
It takes one half second or more for the air to flow through the lines to the brakes.

8. When backing, you should:

use the mirrors on both sides.
back and turn toward the right side whenever possible.
back quickly.
only use mirror on the driver's side.

9. Which of the following is a reason why air tanks must be drained?

Your transmission fluid may drain out.
Your battery fluid may drain out.
Your brakes may fail due to the water freezing.
The governor may stop the compressor from pumping air.

10. What factors can cause brakes to fade?

Slippery surfaces and shaded areas.
Gravel and tar.
Excessive heat and brakes out of adjustment.
Dirt roads and in unpaved yards.

CONNECTICUT CDL AIR BRAKES PRACTICE TEST