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.
1 . To confirm that a trailer has ABS, you can:
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.
2 . The air pressure in a dual air brake system should build from 85 to 100 psi within:
When inspecting a vehicle with a dual air brake system, you should wait for air pressure to build from 85 to 100 psi in both the primary and secondary systems. This should take about 45 seconds.
3 . A wig wag is:
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.
4 . An emergency brake must be controlled by:
All trucks, truck tractors, and buses must be equipped with emergency brakes and parking brakes. Because air pressure can eventually leak away, emergency and parking brakes should be held on by mechanical force.
5 . Brake fading is caused when:
Using the brakes excessively will cause them to overheat, making them less effective. This is referred to as "fading."
6 . Which of the following is not a part of an air brake system?
Air brakes consists of three separate braking systems: the service brake system, the parking brake system, and the emergency brake system.
See the exact questions that will be on the 2024 North Carolina DMV exam.
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