# 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
1.
The stop light switch:
2.
The reduced stopping power caused by overuse of the service brakes and excessive heat is called:
3.
Air tanks need to be drained ______.
4.
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
5.
A mechanical device that drops a low air warning into a drivers view is called a:
6.
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
7.
The main factor in causing brake fade is:
8.
The supply pressure gauge shows how much pressure:
9.
The application pressure gauge shows how much air pressure you:
10.
Brake fade is caused by:
11.
Normally during anti-lock braking, the driver:
12.
Generally, air governor cut-in should be at:
13.
Another name for the brake pedal is the "foot valve", or:
14.
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
15.
When does the air compressor governor allow air to start pumping?
16.
Some vehicles are equipped with a control allowing you to apply the spring brakes gradually, called a:
17.
Spring brakes will come on automatically, but the parking brake can also be applied:
18.
It is not safe to drive a vehicle that has brake drums with cracks that are longer than _____ of the width of the friction area.
19.
When brakes are applied, the brake shoes will press against the:
20.
Average stopping distance under normal conditions at 55 mph is:
21.
Pushing the brake pedal down harder __________.
22.
The most common type of foundation brake is?
23.
You should use the parking brake _____________.
24.
Water and oil _______.
25.
If your brakes are wet, what should you do to dry them quicker?