Free Maryland CDL Air Brakes Practice Test 2023

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The Maryland 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 Maryland 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 Maryland CDL Practice Test to get ready to pass the Maryland CDL Air Brake Test now. 

Our CDL practice tests:
Based on 2021 MD commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
MD CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus?
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 slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
If your vehicle has an alcohol evaporator, it is there to:
The brake system that applies and releases the brakes when the driver uses the brake pedal is the ________ brake system.
What negatively affects the braking power of a spring brake?
When the engine is off and the parking brake released, a single vehicle air loss rate should be less than ________ psi in one minute.
If the low air warning comes on while you are driving, you should:
What happens when your brake drums get very hot?
If the spring brakes are on, when should you push the brake pedal?
The level at which the air compressor stops pumping air is:
The emergency spring brake release knob is:
Total stopping distance with air brakes is Perception distance + Braking Distance + Brake Lag Distance +:
In case of emergency stops, drivers should:
If you need to make an emergency stop, you should brake so that you can ________.
The most common type of foundation brake is?
In dual air systems, how long should it take air pressure to build 85 to 100 psi?
The air compressor is connected to the engine through ______.
Brake linings should not be _______.
Why should air tanks be drained completely?
What is proper braking technique for drivers travelling down a hill or any other downgrade?
Vehicles without automatic air tank drains need to be checked manually to remove ________?
A warning to drivers behind you that the air brakes have been applied is the:
The warning light and buzzer will come on when the air pressure in either system drops below what psi?