Air Brakes #2

FREE Air Brakes Endorsement Test Online | South Dakota 2024

Train for FREE online with our South Dakota 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 SD Class A/Class B driver license in 2021, practice as much as..

Train for FREE online with our South Dakota 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 SD 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.

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1 . What can happen if the air pressure gets too low in an air brake system?

Pressing and releasing the brake pedal unnecessarily can let air out of the braking system faster than the compressor can replace it. Air brakes may cease to work effectively if the pressure becomes too low.

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

Bumpy When inspecting a vehicle with air brakes that has a belt-driven air compressor, you should check the condition and tightness of the belt. It should be in good condition.

3 . The parking brake should be:

Used to stop the vehicle in normal driving. The parking brake should be applied every time you park your vehicle.

4 . Air pressure should build up in a single air system within:

In single air systems, air pressure should build from approximately 50 to 90 psi within three minutes.

5 . Vehicles with dual air brake systems:

Do not need time to build air pressure before a trip. Before driving a vehicle with a dual air brake system, you must allow the air compressor time to build up at least 100 psi of air pressure in both the primary and secondary systems.

6 . If the brake pads rub against the brake drums and create too much heat:

The air compressor will kick on to cool the brakes. Brakes heat up with use. If they are overused and become too hot, expansion and chemical changes will make them less effective and eventually cause them to stop working altogether. This is known as "brake fade."

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