Free Connecticut CDL Air Brakes Practice Test 2023

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The CDL Air Brake has some differences from other endorsements because your license will receive a mark of restriction if you fail the test. So having good preparation before exam day is very necessary. To ensure that our questions are relevant, all of our Connecticut CDL Practice test questions are based on the CT CDL manual. Each question has a detailed explanation for you to thoroughly learn the format and the topic. Don't be afraid of having a restriction on your license. Let’s try our free CDL Practice Test to get ready to pass the Connecticut CDL Air Brake Test now. 

Our CDL practice tests:
Based on 2021 CT commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
CT CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
The air compressor stops pumping air at what psi?
If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks?
A dual air brake system ________.
At 55 mph on dry pavement, the air brake lag distance is how many feet?
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
The brake system that applies and releases the brakes when the driver uses the brake pedal is the ________ brake system.
In ideal conditions a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet?
When the engine is off and the parking brake released, a single vehicle air loss rate should be less than ________ psi in one minute.
Where is the modulating control valve located on some vehicles?
When increased application pressure to maintain the same speed becomes necessary, you should ______.
If the air compressor should develop a leak, what keeps the air in the tanks?
The safety valve reduces pressure at ___ psi.
If you are driving down a steep downgrade and have reached your safe speed of 40 mph, you would apply the service brake until your speed dropped to ____ mph.
Besides heat, another cause of brake fade is:
What tells the driver how much air pressure is in the air tanks?
The trailer air supply knob is usually:
At what level will the low air warning usually take effect?
When driving an older vehicle that has a manual front brake limiting valve, drivers should:
The braking power of the spring brakes ______.
During a normal drive, the spring brakes are held back by _____.
How often should alcohol containers be checked during cold weather?
Spring brakes are applied:
What does ABS stand for?
What is the purpose of an air storage tank?
Vehicles with ABS have malfunction lamps that are what color?