Air Brakes #1
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.
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19 . During an applied leakage test, the maximum leakage rate for a double combination vehicle is:
4 psi in a minute.
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?
The vehicle should stop.
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:
Pull the brake pedal up.
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?
Controls the temperature of the air leaving the air storage tanks.
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:
4 psi in a minute.
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:
Only if it is warm outside.
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.
No more than one inch
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.
2025 Colorado | Frequently Asked Questions
To secure a CDL Bus endorsement in Colorado, you must first have a valid Commercial Driver's License (CDL). Next, pass the Passenger Vehicles Endorsement Knowledge Test and the School Bus Endorsement Knowledge Test. Finally, pass a driving skills test in the type of school bus you wish to drive. All tests are administered by the Colorado DMV.
To obtain a CDL Bus license in Colorado, you need to have a valid driver's license, pass a medical examination, and complete a CDL application. After that, you must pass the General Knowledge Test and the Passenger Transport Test. Finally, you will need to pass a skills test in a vehicle similar to the one you'll be driving.
Yes, specific training is necessary for a CDL Bus endorsement in Colorado. Applicants must complete a commercial driver's license training course that includes both classroom and behind-the-wheel instruction. Additionally, they must pass written and skills tests specific to the type of bus they wish to drive, demonstrating knowledge of safety procedures and handling.
CDL Bus licenses fall under three main classes in Colorado: Class A, B, and C. Class A is for any combination of vehicles with a Gross Combination Weight Rating (GCWR) of 26,001 lbs or more. Class B is for a single vehicle with a Gross Vehicle Weight Rating (GVWR) of 26,001 lbs or more. Class C is for vehicles designed to transport 16 or more passengers (including the driver), or hazardous materials.
No, you cannot use your personal vehicle for the CDL Bus driving test in Colorado. The test must be taken in a vehicle that matches the class and type of the CDL you are applying for. In this case, you must take the test in a commercial bus similar to the one you plan to drive professionally.
The CDL Bus driving test evaluates a variety of skills. These include pre-trip vehicle inspection, basic vehicle control (backing, turning, and stopping), and on-road driving, which involves lane changes, highway driving, and interaction with traffic. Additionally, specific bus operation skills such as loading/unloading passengers, railroad crossing procedures, and emergency exit procedures are also assessed.
Yes, in Colorado, to obtain a CDL Bus endorsement, applicants must pass a Department of Transportation (DOT) physical exam. This test evaluates vision, hearing, blood pressure, and checks for conditions like diabetes and epilepsy. Applicants must also be free from any physical or mental condition that might affect their ability to safely operate a commercial vehicle.
No, it's not permissible. In Colorado, as in all U.S. states, a valid Commercial Driver's License (CDL) with a Passenger (P) endorsement is required to legally transport passengers in a commercial vehicle. Driving without the appropriate license or endorsement can lead to serious penalties including fines and suspension of driving privileges.
You can add a CDL Bus endorsement to your existing Commercial Driver's License in Colorado. It's not necessary to apply for a new license. However, you will have to pass the Passenger Transport Test, and in some cases, a skills test in the type of vehicle you wish to drive. Always check with your local DMV for specific requirements.
Yes, there are restrictions for drivers with a CDL Bus endorsement in Colorado. Drivers must not have any serious traffic violations within the past two years. They're also required to maintain a clean driving record, pass regular physical exams, and comply with drug and alcohol regulations. Violating these can result in temporary or permanent loss of the endorsement.