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

Are not required on vehicles with air brakes.

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.

Use wheel chocks to prevent your vehicle from moving.

Use wheel chocks, but only if you have applied the parking brake.

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.

Opened to drain the tanks after each day.

FREE Air Brakes Endorsement Test Online | Iowa 2024

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 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 | Iowa 2024

1 . Emergency brakes:

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

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

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

5 . Manual air tank drains should be:

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

See the exact questions that will be on the 2024 DMV exam.

Wait, before you go