Air Brakes Endorsement Test | Colorado 2025 #1 Page 4 of 4
Train for FREE online with our Colorado 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 CO 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.
19 . During an applied leakage test, the maximum leakage rate for a double combination vehicle is:
It is important to know the maximum air loss rate that is safe for your specific vehicle. A double combination vehicle should have a leakage rate no higher than 4 psi in a minute during an applied leakage test.
20 . What happens if the air pressure in a system's air tanks falls below 60 psi?
In an air brake system, a low pressure warning signal should activate if the pressure in the air tanks falls to a level below 60 psi. This signal may be in the form of a warning light or a wig wag.
21 . To stop in a vehicle that uses air brakes, the driver should:
To make a normal stop in a vehicle with air brakes, push the brake pedal down. The harder the pedal is pressed, the more air pressure is released.
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 air storage tanks.
23 . During an applied leakage test, the maximum leakage rate for a triple combination vehicle is:
It is important to know the maximum air loss rate that is safe for your specific vehicle. A triple combination should have a leakage rate no higher than 6 psi in a minute during an applied leakage test.
24 . When the brake pedal is pushed down, air brakes work:
Because air takes time to flow through the air lines to the brakes, air brakes cannot begin working instantly. There is often a brake lag of at least one-half of a second between the moment the brake pedal is pressed and the moment the brakes begin to work.
25 . When inspecting your brakes, a slack adjuster should move ____ from where it is attached to the push rod.
Check each slack adjuster after setting wheel chocks and disengaging the parking brake. Pull the slack adjusters to make sure they do not move more than about one inch from where the push rod is attached. If they move more than one inch, they may be out of adjustment and will need to be fixed.
See the exact questions that will be on the 2025 Colorado DMV exam.
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