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.

Brakes are designed to take a lot of heat, but drivers should not rely solely on the brakes to slow their vehicle. Brakes may fade and lose their ability to slow down the vehicle if they become too hot, so drivers should also rely on the engine braking effect.

The brakes may squeak more than usual.

The brakes will brake unevenly.

On long and/or steep downgrades, you should primarily use engine braking to control the speed of your vehicle. Use your brakes only as a supplement to this effect.

The vehicle should be placed in a low gear and the driver should use engine braking.

The driver should continually downshift instead of using the brakes.

Some air brake systems contain an alcohol evaporator. This device introduces alcohol into the braking system to inhibit the formation of ice.

To reduce the risk of ice forming in air brake valves.

To make the compressor run more efficiently.

To lubricate parts of the braking system.

To reduce the risk of rust forming on air brake valves.

New hampshire Driver's Examination

Air Brakes #1

FREE Air Brakes Endorsement Test Online | New Hampshire 2024

Train for FREE online with our New Hampshire 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 NH Class A/Class B driver license in 2021, 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

FREE Air Brakes Endorsement Test Online | New Hampshire 2024

1 . A low air pressure warning signal should activate:

2 . Using the brakes creates heat. If too much heat is produced:

3 . When traveling down a steep downgrade:

4 . During a walk-around inspection, ensure there are no cracks on the brake drums that are more than ____ of the width of the friction area.

5 . What is removed when an air tank is drained?

6 . Some air brake systems use alcohol:

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