If you are unsure if a trailer is equipped with an Anti-Lock Braking System (ABS), look under the vehicle for the electronic control unit and wheel speed sensor wires coming from the back of the brakes.

Look under the trailer for wheel speed sensors coming from the back of the brakes.

Look under the hood for the ABS sticker.

Remove a tire and look for the ABS sensor on the axle.

Vehicles with air brakes are required to be equipped with a low pressure warning device. A wig wag is a type of low air pressure warning device. This device drops a mechanical arm into the driver's view if the pressure in the tanks drops to a level between 55 and 75 psi.

A tube that carries air to the brakes.

Using the brakes excessively will cause them to overheat, making them less effective. This is referred to as "fading."

Brakes are not used often enough.

Air Brakes Endorsement Test | North Carolina 2024 #2

Train for FREE online with our North Carolina 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 NC 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 | North Carolina 2024 #2

1 . To confirm that a trailer has ABS, you can:

2 . The air pressure in a dual air brake system should build from 85 to 100 psi within:

3 . A wig wag is:

4 . An emergency brake must be controlled by:

5 . Brake fading is caused when:

6 . Which of the following is not a part of an air brake system?

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