Free Massachusetts CDL Air Brakes Practice Test 2023

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The Massachusetts CDL Air Brake test 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 CDL practice test packs are based on the MA 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 Massachusetts CDL Practice Test to get ready to pass the Massachusetts CDL Air Brake Test now. 

Our CDL practice tests:
Based on 2021 MA commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
MA CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
An air compressor can be cooled by _______.
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks fall below ____ psi.
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.
An air brake system is fully charged at what psi?
The 3 individual systems of the air brakes are the service brakes, emergency brake, and:
On a long or steep downgrade, the foot brakes should be used:
If your vehicle has an alcohol evaporator, it is there to:
The low air pressure warning signal indicates:
When increased application pressure to maintain the same speed becomes necessary, you should ______.
When you release the brakes and reduce the air pressure what makes up for that air loss?
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.
If the low air pressure warning light comes on, you should:
If air pressure is not built up within the correct amount of time, then:
The S-cam:
After the initial pressure drop, air leakage for combination vehicles should be less than:
How should the air leakage rate be tested?
Why does a heavily loaded vehicle need a longer distance to stop?
On newer vehicles what color is the parking brake knob?
How are brakes designed?
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
Stop light switches are necessary because ________.
The parking brake should be used:
Typically, at what psi does the air compressor governor stop the compressor from pumping air?
What is an alternative name for a brake pedal?