In a vehicle with dual parking control valves, there is a separate air tank that can be used to temporarily release the spring brakes if they have been activated due to low air pressure. Pushing in the proper control will release the spring brakes for a short period of time, allowing the driver to move the vehicle in an emergency.

To temporarily release the spring brakes.

To make the air brakes work more effectively.

To temporarily release the spring brakes.

To charge the brakes on the rear trailer.

In newer vehicles with air brakes, the parking brake is controlled by a yellow, diamond-shaped knob. The driver should pull the knob outward to apply the parking brakes and push the knob inward to release them.

Pulling a yellow, diamond-shaped knob.

Pushing a yellow, diamond-shaped knob.

Pulling a yellow, diamond-shaped knob.

The low air pressure warning signal must activate before the air supply pressure drops below 55 psi in the air tank. If the warning signal does not turn on when being tested during an inspection, the vehicle is not safe to drive.

The warning light should activate.

The vehicle will be unable to shift out of gear.

If you have an Anti-Lock Braking System (ABS) equipped on only the tractor, only the trailer, or only one axle, you will still have more control over the vehicle when braking than you would without ABS. You should brake normally.

Still allows you additional control when braking.

Slows the vehicle, but cannot stop it.

Air Brakes Endorsement Test | Vermont 2024 #1 Page 4 of 4

Train for FREE online with our Vermont CDL air brake test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a VT Class A/Class B driver license in 2024, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that the requirements for CDL may vary from state to state.

Number of Question 25

Passing Score 20

Number of Tests 20

Air Brakes Endorsement Test | Vermont 2024 #1 Page 4 of 4

19 . In a vehicle with dual parking control valves, a separate air tank can be used:

20 . What color light indicates a vehicle's ABS is not working?

21 . The parking brake in a newer vehicle is applied by:

22 . What can happen if the air pressure gets too low in an air brake system?

23 . What should happen before the air pressure in an air brake system tank falls below 55 psi?

24 . Having ABS on only one axle:

25 . During a static leakage test, what is the maximum leakage rate that is safe for a double combination vehicle?

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