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
A driver needs to be able to see a warning when the air pressure in the service air tanks falls below ______.
How far should manual slack adjusters move before they need to be adjusted?
Excessive use of the service brakes results in overheating which can lead to:
On a long or steep downgrade, the foot brakes should be used:
The ____ shows how much pressure is in the air tanks.
Brake fade is caused by:
In ideal conditions a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet?
When the engine is off and the parking brake released, a single vehicle air loss rate should be less than ________ psi in one minute.
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
When does the air compressor governor allow air to start pumping?
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.
What happens when your brake drums get very hot?
To check the free play of manual slack adjusters of S-cam brakes, you should park on:
After the initial pressure drop, air leakage for single vehicles should be less than:
What tells the driver how much air pressure is in the air tanks?
A device that limits the amount of air provided to the front brakes is a:
After the initial pressure drop, air leakage for combination vehicles should be less than:
To test the parking brake, stop the vehicle, put the parking brake on, and:
Pushing the brake pedal down harder __________.
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
Automatic adjusters should ________.
Why do air brakes take longer to stop than hydraulic brakes?
What is proper braking technique for drivers travelling down a hill or any other downgrade?
What is a wig wag ?
Manual air tank drains require: