Free Missouri CDL Air Brakes Practice Test 2022

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

Our CDL practice tests:
Based on 2022 MO commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
MO CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
1.
The most common type of foundation brakes are:
2.
Modern air brakes combine three different systems. They are the service, the parking, and the _____ brakes.
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.
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?
5.
In case of a low air situation, the spring brakes should come on at:
6.
Spring brakes will generally come on at:
7.
Brake fade is caused by:
8.
In ideal conditions a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet?
9.
When the engine is off and the parking brake released, a single vehicle air loss rate should be less than ________ psi in one minute.
10.
What negatively affects the braking power of a spring brake?
11.
Where is the modulating control valve located on some vehicles?
12.
"Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the proper level of alcohol?"
13.
If your truck has a dual air brake system, and one of the systems is low on pressure:
14.
Total stopping distance with air brakes is Perception distance + Braking Distance + Brake Lag Distance +:
15.
The trailer air supply knob is usually:
16.
In case of emergency stops, drivers should:
17.
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
18.
On newer vehicles what color is the parking brake knob?
19.
How should the air leakage rate be tested?
20.
Brake linings should not be _______.
21.
On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be what color?
22.
The safety valve in the air compressor tank is set to open at _____.
23.
A warning to drivers behind you that the air brakes have been applied is the:
24.
What is the purpose of an air storage tank?
25.
What does ABS stand for?