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.

In general, you should always use the parking brake when parking your vehicle. However, you should not apply the parking brake if your brakes are very hot or if your brakes are wet and temperatures are below freezing.

The parking brake should be used.

The parking brake only needs to be used if the vehicle is parked on a slope.

The parking brake should not be used, as it can damage the tires.

In an air brake system, a low air pressure warning signal must come on if air pressure in the tanks falls below 60 psi. This warning signal may come in the form of a light, a buzzer, or a wig wag.

When tank pressure falls below 60 psi.

When tank pressure falls below 120 psi.

When tank pressure falls below 60 psi.

When tank pressure falls below 10 psi.

When tank pressure falls below 5 psi.

If used and maintained properly, air brakes are a safe and effective way to stop large, heavy vehicles.

Air brakes are very effective systems.

Other brake systems squeak too loudly.

Air brakes are very effective systems.

Other braking systems are hard to come by.

Because air takes time to flow through the air lines to the brakes, air brakes cannot begin working instantly. There is often a brake lag of at least one-half of a second between the moment the brake pedal is pressed and the moment the brakes begin to work.

The time required for the brakes to work after the brake pedal is pressed

The distance between the brake pedal and the floor

The amount of air pressure used to stop the vehicle

Air Brakes Endorsement Test | Ohio 2025 #2

Train for FREE online with our Ohio 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 OH Class A/Class B driver license in 2025, 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 | Ohio 2025 #2

1 . Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction lamps to indicate when the ABS is not working.

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

3 . When leaving your vehicle unattended:

4 . A low air pressure warning signal should activate:

5 . Why do large vehicles use air brakes?

6 . What is brake lag?

See the exact questions that will be on the 2025 DMV exam.

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