20 Tests

Air Brakes Endorsement Test Online | Iowa 2020

Train for FREE online with our Iowa 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 IA Class A/Class B driver license in 2020, practice as much as.. Read More

Train for FREE online with our Iowa 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 IA Class A/Class B driver license in 2020, 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 . Emergency brakes:

All trucks, truck tractors, and buses must be equipped with emergency brakes and parking brakes.

2 . When parking, you should not use the parking brake if:

If your brakes are hot after coming down a steep grade, you should not use your parking brake when parking. Let your brakes cool before applying the parking brake or risk damaging the brakes.

3 . When parked on a flat surface, you should:

When parking on a level surface, you should use wheel chocks. If the vehicle is not equipped with spring brakes, this is essential to prevent the trailer from moving.

4 . What do air brakes use to make the brakes work?

Many large CMVs are equipped with air brakes. An air braking system uses compressed air to operate.

5 . Manual air tank drains should be:

Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Manually operated air tank drains must be opened daily to remove this build-up.

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

In an air brake system, air tanks have drains to remove accumulations of water and compressor oil. Allowing water and oil to accumulate in the system could cause damage to the brakes.

Wait, before you go

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