In an air brake system, a low air pressure warning signal must come on if air pressure in the tanks falls below 55 psi. This warning signal may come in the form of a light, a buzzer, or a wig wag.

When tank pressure falls below 55 psi.

When tank pressure falls below 120 psi.

When tank pressure falls below 55 psi.

When tank pressure falls below 10 psi.

When tank pressure falls below 5 psi.

The purpose of an Anti-Lock Braking System (ABS) is to prevent wheel lockup while brakes are being applied.

An Anti-Lock Braking System (ABS)

If equipped, ABS is in addition to a vehicle's normal braking system and does not increase or decrease the braking power of any other system. ABS only activates when a vehicle's wheels are about to lock.

Are in addition to other braking systems and do not reduce a vehicle's braking power.

Reduce a vehicle's normal braking capacity.

Are in addition to other braking systems and do not reduce a vehicle's braking power.

Are not effective on larger vehicles.

A dual air brake system is made up of two separate air brake systems. The systems share a single set of brake controls, but each has its own air tanks, hoses, and lines. One system typically operates the regular brakes on the rear axle or axles while the other system operates the regular brakes on the front axle.

Consists of two separate air brake systems that share a single set of controls.

Is a single air brake system with two different sets of controls.

Consists of one air brake system for the left side of the truck and one system for the right side of the truck, each with its own set of controls.

Friction inside a brake drum is caused when the brake shoes and linings push against the inside of the drum. The friction in the drums will slow and stop the vehicle.

Press against the inside of the brake drum.

Press against the outside of the brake drum.

Press against the inside of the brake drum.

If water and compressor oil are left to build up in an air brake system, the system can be damaged. Air storage tanks are equipped with drains to allow this accumulation to be removed. Manually controlled drains should be operated at the end of each day of driving.

Are necessary for the proper function of the system.

Should take up about 10 percent of the tank.

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

Train for FREE online with our Alaska 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 AK 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 | Alaska 2024 #1 Page 4 of 4

19 . A low air pressure warning signal should activate:

20 . What helps prevent wheel lockup when braking?

21 . Anti-Lock Braking Systems (ABS):

22 . What is often found in compressed air?

23 . A dual air brake system:

24 . Friction in an S-cam brake is caused when the brake shoes and linings:

25 . Some water and compressor oil is usually found in the compressed air within an air brake system. The water and compressor oil:

See the exact questions that will be on the 2024 DMV exam.

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