Air Brakes Endorsement Test | Illinois 2025 #1 Page 3 of 4
Train for FREE online with our Illinois 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 IL Class A/Class B driver license in 2025, 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.
13 . How is the parking brake released?
In vehicles with air brakes, the parking brake is controlled by a knob. The knob is pulled out to apply the brakes, and pushed in to release them.
14 . Which type of brakes do most heavy-duty vehicles have?
For safety, most heavy-duty vehicles are equipped with dual air brake systems.
15 . Vehicles with dual air brake systems:
Before driving a vehicle with a dual air brake system, allow time for the air compressor to build up pressure of at least 100 psi in both the primary and secondary systems.
16 . In a dual air brake system:
A dual air brake system is made up of two separate air brake systems. The systems share a single set of brake controls, but each has its own air tanks, hoses, and lines.
17 . 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 air storage tanks.
18 . The safety valve located on the first tank opens:
In an air brake system, the first tank that receives compressed air has a safety valve that releases air if the pressure gets too high. It is usually set to open at 150 psi. If the valve must open, there is a fault in the system that should be repaired by a mechanic.
See the exact questions that will be on the 2025 Illinois DMV exam.
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