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
The air compressor stops pumping air at what psi?
The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
During normal driving, spring brakes are usually held back by:
A low pressure warning signal could be __________.
If your truck has a properly functioning dual air brake system and minimum size air tanks, the air pressure should build up from 85 to 100 psi within how many seconds?
Why drain water from compressed air tanks?
When testing air leakage rates for single vehicles, initial loss rate should be less than:
Normally during anti-lock braking, the driver:
When you need to apply more pressure to help your brakes work normally effectively, this means that your brakes are fading. Which of the following can cause fading brakes?
Which braking system applies and releases the parking brakes when you use the parking brake control?
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
Air governor cut-out should be at around:
The safety valve is set automatically when pressure is:
What must the air pressure be, at minimum, in both parts of a dual air brake system?
A device that limits the amount of air provided to the front brakes is a:
To stop the vehicle, the brake shoes and linings are pushed against:
The most common problem found in roadside inspections is:
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
When inspecting the air brake system, what particular item in the engine compartment should the driver pay specific attention to?
On newer vehicles what color is the parking brake knob?
How should the air leakage rate be tested?
Initial air leakage rate for combination vehicles should be:
Automatic adjusters should ________.
You should use the parking brake _____________.
What does the air compressor governor control?