# Free Idaho CDL Air Brakes Practice Test 2023

Do you need an Idaho Air Brakes endorsement or an L endorsement for your commercial driving license? The Idaho 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 Idaho 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 Idaho CDL practice test to get ready to pass the Idaho CDL Air Brake Test now.

Our CDL practice tests:
Based on 2021 ID commercial driver's license manual
Perfect for first-time, renewal applicants
ID CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
To test air service brakes you should:
2.
All air brake equipped vehicles have:
3.
A low pressure warning signal could be __________.
4.
How far should manual slack adjusters move before they need to be adjusted?
5.
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
6.
In ideal conditions a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet?
7.
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
8.
When stab braking if you re-apply the brakes before the wheels start rolling, __________.
9.
What is the purpose of an antilock braking system (ABS)?
10.
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
11.
What is a \"Wig Wag\"
12.
If air pressure is not built up within the correct amount of time, then:
13.
14.
The trailer air supply knob is usually:
15.
Under normal braking conditions, the vehicle:
16.
At what level will the low air warning usually take effect?
17.
How should the air leakage rate be tested?
18.
In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
19.
20.
Why should air tanks be drained completely?
21.
What does the air compressor governor control?
22.
To avoid damaging the brakes, what should you never do while the spring brakes are applied?
23.
The parking brake should be used:
24.
The governor stops the compressor from pumping air at:
25.
Vehicles with air brakes have pressure gauges connected to the _______.