# 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
Perfect for first-time, renewal applicants
MA CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
To test air service brakes you should:
2.
The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
3.
What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus?
4.
A low air pressure warning signal is ________.
5.
The air brake lag distance at 55 mph on dry pavement adds about ____ feet.
6.
How far should manual slack adjusters move before they need to be adjusted?
7.
The most important thing to do when a low air pressure warning comes on is:
8.
To stop the vehicle, air brakes systems use:
9.
What negatively affects the braking power of a spring brake?
10.
When the safety valve releases air this indicates ___________.
11.
What happens when your brake drums get very hot?
12.
If the spring brakes are on, when should you push the brake pedal?
13.
The level at which the air compressor stops pumping air is:
14.
15.
To stop the vehicle, the brake shoes and linings are pushed against:
16.
You should avoid using the parking brake when _______.
17.
If you need to make an emergency stop, you should brake so that you can ________.
18.
In dual air systems, how long should it take air pressure to build 85 to 100 psi?
19.
Brake drums should not have cracks longer than what length?
20.
In a dual air brake system, if the air pressure in one part of the system drops enough to set off the low air warning:
21.
At minimum, a dual air system should build up to what psi in the primary and secondary systems?
22.
Vehicles without automatic air tank drains need to be checked manually to remove ________?
23.
The spring brakes of a tractor will come on when the air pressure falls within _______.
24.
A warning to drivers behind you that the air brakes have been applied is the:
25.
What does ABS stand for?