Free South Carolina CDL Air Brakes Practice Test 2023

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

Our CDL practice tests:
Based on 2021 SC commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
SC CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
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?
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
The brake system that applies and releases the brakes when the driver uses the brake pedal is the ________ brake system.
When the air system is low ________.
Normally during anti-lock braking, the driver:
Which braking system applies and releases the parking brakes when you use the parking brake control?
When does the air compressor governor allow air to start pumping?
To check the free play of manual slack adjusters of S-cam brakes, you should park on:
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
Which of these is NOT a proper time to apply the parking brakes?
Pressing and releasing the brake pedal unnecessarily:
In case of emergency stops, drivers should:
The trailer air supply knob is usually:
To test the parking brake, stop the vehicle, put the parking brake on, and:
Controlled braking is only possible _________.
When inspecting the air brake system, what particular item in the engine compartment should the driver pay specific attention to?
Pushing the brake pedal down harder __________.
Automatic air tanks _______.
In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
To prevent too much pressure from building up in the system, what is installed?
What does ABS stand for?
What is an alternative name for a brake pedal?
The warning light and buzzer will come on when the air pressure in either system drops below what psi?
If your brakes are wet, what should you do to dry them quicker?