Air Brakes #1

Air Brakes Endorsement Test | Virginia 2026 #1 Page 4 of 4

Train for FREE online with our Virginia 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 VA Class A/Class B driver license in 2026, practice as much as.. Read More

Train for FREE online with our Virginia 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 VA Class A/Class B driver license in 2026, 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.

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19 . If an air compressor is belt-driven, the belt should be routinely checked to ensure that it is:

If your vehicle has air brakes, the air compressor drive belt should be checked before each drive. Check the tightness of the belt and verify that it is in good condition.

20 . What do the two systems of a dual air brake system share?

Both systems in a dual air brake systems share a single air compressor. If the air compressor is damaged, neither system will be able to operate properly.

21 . Do not operate a vehicle if any brake drums have cracks that are larger than ____ of the width of the friction area.

Before beginning a trip, it is important to check the brake drums during your walk-around inspection. It is unsafe to drive if any brake drum has a crack more than one half of the width of the friction area.

22 . What does the air compressor governor do?

In an air brake system, the air compressor governor controls when the air compressor pumps air into the storage tanks. It stops pumping if the pressure in the tanks becomes too high, and begins pumping if the pressure becomes too low.

23 . When leaving your vehicle unattended:

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.

24 . If the air pressure in an air brake system becomes too low, it may:

If the pressure in an air brake system becomes too low, the brakes will no longer work. If the low pressure warning signal activates, you should leave the road and stop safely while you still have braking power.

25 . When you are about to start down a hill, you should switch into a ____ gear.

Before starting down a hill, be sure to switch into a low gear. Gravity will increase your vehicle's speed as you travel downhill.

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