# 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
1.
In case of emergency when driving a vehicle equipped with dual parking control valves, you should:
2.
A low air pressure warning signal is ________.
3.
The proper use of the brakes when going down a long steep grade after selecting a proper gear is to brake until your speed is about ____ below the posted speed and release your brake.
4.
To test the vehicle's service brakes, move the vehicle:
5.
6.
If you must make an emergency stop, you should brake so you:
7.
The low air pressure warning signal indicates:
8.
When the safety valve releases air this indicates ___________.
9.
What should a driver do when the low air pressure warning signal comes on?
10.
Which braking system applies and releases the parking brakes when you use the parking brake control?
11.
When stab braking if you re-apply the brakes before the wheels start rolling, __________.
12.
If the air compressor should develop a leak, what keeps the air in the tanks?
13.
If you must make an emergency stop, you should brake so you:
14.
All of the following are factors in total stopping distance except:
15.
In a dual air brake system, the first system, supplying the rear brakes, is commonly known as the "primary" system, and the other as the:
16.
With air brake vehicles, the parking brakes should be used:
17.
You should avoid using the parking brake when _______.
18.
In dual air systems, how long should it take air pressure to build 85 to 100 psi?
19.
When driving an older vehicle that has a manual front brake limiting valve, drivers should:
20.
Why should air tanks be drained completely?
21.
If the air compressor has its own oil supply you should do what before driving?
22.
Vehicles without automatic air tank drains need to be checked manually to remove ________?
23.
The governor stops the compressor from pumping air at:
24.
On a long or steep downgrade, how should vehicle speed be primarily controlled?
25.
The warning light and buzzer will come on when the air pressure in either system drops below what psi?