Free Pennsylvania CDL Air Brakes Practice Test 2023

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

Our CDL practice tests:
Based on 2021 PA commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
PA CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
Air brakes consist of ________.
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
During normal driving, spring brakes are usually held back by:
The air brake lag distance at 55 mph on dry pavement adds about ____ 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.
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
Your truck has a dual air system and one of the systems loses its pressure. What will happen?
In a controlled braking emergency:
While applying the brakes, what tells the driver how much air pressure is being used?
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?
When should the spring brakes activate?
"Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the proper level of alcohol?"
The parking brake should not be used when wet in freezing temperatures, or:
The manual adjustment of automatic slack adjusters is:
The trailer air supply knob is usually:
Pressing and releasing the brake pedal unnecessarily:
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
Controlled braking is only possible _________.
The air compressor is connected to the engine through ______.
Why should you drain water from compressed air tanks?
Brake drums or discs _______.
What is used to put alcohol into the system and reduce ice risk?
What brake system uses part of the service and parking brake systems to stop the vehicle in the event of a brake system failure?
What is the purpose of a supply pressure gauge?
To test the parking brake you should _______.