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
Excessive use of the service brakes results in overheating which can lead to:
A dual air brake system ________.
At 55 mph on dry pavement, the air brake lag distance is how many feet?
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ____ psi.
Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.
The 3 individual systems of the air brakes are the service brakes, emergency brake, and:
The ____ shows how much pressure is in the air tanks.
Spring brakes will generally come on at:
The application pressure gauge shows how much air pressure you:
When the safety valve releases air this indicates ___________.
When performing the controlled braking method for an emergency stop, you are _________.
Generally, air governor cut-in should be at:
"Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the proper level of alcohol?"
The trailer air supply knob is usually:
Compared to hydraulic brakes, air brakes add how much distance to an average 55 mph stop?
Repeatedly partially increasing and pressing the brake pedal may result in:
In case of air pressure loss, a mechanical means of preventing the vehicle from moving is called:
In order to make contact with the brake drum, the brake pads and linings are pushed outward by the:
With air brake vehicles, the parking brakes should be used:
In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
Why should you drain water from compressed air tanks?
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
The air tanks must be drained because:
What brake system uses part of the service and parking brake systems to stop the vehicle in the event of a brake system failure?
Vehicles with air brakes have pressure gauges connected to the _______.