In an air brake system, the air tanks are equipped with drains that allow water and compressor oil to be removed from the system. If allowed to build up, water and compressor oil can damage an air brake system.

Are used to drain water and oil from air tanks.

Allow rain water to enter air tanks.

Are used to drain water and oil from air tanks.

Must remain open while driving.

If a tractor is equipped with an Anti-Lock Braking System (ABS) but the trailer is not, the risk of jackknifing will be reduced and the driver should still be able to maintain steering control. If only the trailer is equipped with ABS, it is less likely that the trailer will swing out to one side.

There is a decreased risk of jackknifing.

There is an increased risk of jackknifing.

The brakes will not work as effectively as they would without ABS.

The brakes will become more sensitive.

In newer vehicles with air brakes, the parking brakes are controlled by a diamond-shaped yellow knob. Pull the knob out to activate the parking brakes and push it in to release them.

By pushing in the brake control knob

By tapping on the brake pedal three times

By pushing in the brake control knob

By tapping the accelerator twice

Before driving, you should always verify that your service brakes are in good working order. Testing the brakes before a trip allows you to locate any problems before you need to brake while on the road.

Only be tested by a trained mechanic.

To make a normal stop in an air-braked vehicle, push the brake pedal down and control the pressure so that the vehicle comes to a smooth, safe stop.

Lift the brake pedal toward them.

Air Brakes Endorsement Test | District Of Columbia 2024 #2

Train for FREE online with our District Of Columbia 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 DC 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 | District Of Columbia 2024 #2

1 . Air tank drains:

2 . When only the tractor is equipped with an Anti-Lock Braking System (ABS):

3 . How is the parking brake released?

4 . Service brakes should:

5 . If a vehicle has air brakes, the air compressor drive belt should be checked before each drive. In what condition should the belt be?

6 . To make a stop in a vehicle using air brakes, the driver should:

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

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