CDL Air Brakes Practice Test 2024: Endorsements Permit Test

CDL Air Brakes Practice Test 2024: Endorsements Permit Test: Try our free Commercial Driver’s License Permit Test (CDL) Air Brakes Practice Test in the USA: In addition, you can also download a printable PDF for the Air Brake Endorsements Permit Test.

If you want to drive a truck or bus with air brakes, or pull a trailer with air brakes, you need to read this section. If you want to pull a trailer with air brakes, you also need to read the Combination Vehicles section.

CDL Air Brakes Practice Test 2024: Endorsements Permit Test

CDL Air Brakes Practice Test 2024

Air brakes use compressed air to make the brakes work. Air brakes are a good and safe way of stopping large and heavy vehicles, but the brakes must be well maintained and used properly. Air brakes are really 3 different braking systems: service brake, parking brake, and emergency brake.

• The service brake system applies and releases the brakes when you use the brake pedal during normal driving.
• The parking brake system applies and releases the parking brakes when you use the parking brake control.
• The emergency brake system uses parts of the service and parking brake systems to stop the vehicle in a brake system failure.

Test Name CDL Practice Test 2024
Language English
License Endorsements Permit
Total Questions 50 sample questions
Test For Commercial Driver License
Test Preparation  Air Brake Endorsements
Country USA
Explanation No
0%
0 votes, 0 avg
82

CDL Air Brakes Practice Test

1 / 50

A warning signal you can see must come on before the air pressure in the tanks falls below ______ psi.

2 / 50

If the safety valve releases air, the air braking system is working properly.

3 / 50

What gauge tells you how much pressure is in the air tanks?

4 / 50

__________ are used to hold compressed air

5 / 50

This type of brake is a parking brake held on by mechanical force.

6 / 50

The use of brakes on a long, steep downgrade is only a supplement to the braking effect of the engine.

7 / 50

What brake system has 2 separate air brake systems, which use a single set of brake controls?

8 / 50

Air brakes use __________ to make the brakes work

9 / 50

To test that spring brakes come on automatically, all of the following are true except:

10 / 50

The braking power of spring brakes depends on the brakes being in adjustment. If the brakes are not adjusted properly, __________ will work right.

11 / 50

While driving down long, steep downgrades, your brakes

12 / 50

When the tank pressure falls to the "cut-in" pressure (around ____ psi), the governor allows the compressor to start pumping again.

13 / 50

Which vehicles must have low air pressure warning signals?

14 / 50

The __________ system uses parts of the service and parking brake systems to stop the vehicle in a brake system failure.

15 / 50

Never push the brake pedal down when the spring brakes are on

16 / 50

There are special braking procedures you must follow when driving a tractor trailer combination with ABS?

17 / 50

This gauge shows how much air pressure you are applying to the brakes

18 / 50

What part of the braking system is used to adjust the brakes?

19 / 50

For dual air systems, air pressure should build

20 / 50

Front wheel braking is good under all conditions.

21 / 50

Tractor and straight truck spring brakes will come fully on when air pressure drops to a range of _________ psi

22 / 50

Front wheel brakes are only good for driving under wet or icy conditions.

23 / 50

Pressing and releasing the pedal unnecessarily can let air out faster than the compressor can replace it. If the pressure gets too low, the __________ won't work.

24 / 50

The __________ controls when the air compressor will pump air into the air storage tanks.

25 / 50

In newer vehicles with air brakes, you put on the __________ using a diamond-shaped, yellow, push-pull control knob.

26 / 50

__________ are most often used for emergency and parking brakes

27 / 50

The __________ pumps air into the air storage tanks (reservoirs).

28 / 50

What keeps air from going out if the air compressor develops a leak?

29 / 50

How often should you drain your air tanks?

30 / 50

The __________ protects the tank and the rest of the system from too much pressure

31 / 50

All vehicles with air brakes have a pressure gauge connected to the __________.

32 / 50

You should be in the proper gear before starting down a hill.

33 / 50

Compressed air usually has some __________ in it, which is bad for the air brake system.

34 / 50

When making a normal stop in a manual transmission vehicle you should engage the clutch __________

35 / 50

Do not use parking brakes if the brakes are very hot or if the brakes are very wet in freezing temperatures.

36 / 50

A slack adjuster needs adjustment if it move more than how many inches from where the push rod attaches to it?

37 / 50

The _______ system applies and releases the parking brakes when you use the parking brake control

38 / 50

What is the maximum leakage rate for single vehicles in the Applied Leakage Test?

39 / 50

To test the low pressure warning signal, all of the following must be done except:

40 / 50

What is the maximum leakage for a combination of 2 vehicles in the Applied Leakage Test?

41 / 50

The air compressor should cut out no higher than ___ psi and should cut in no lower than ___ psi for a bus, and no lower than ___ psi for trucks.

42 / 50

What is the maximum leakage for a combination of 3 or more vehicles in the Applied Leakage Test?

43 / 50

Compressed air usually has some water and some compressor oil in it, which is bad for the air brake system. The water can freeze in cold weather and cause brake failure

44 / 50

Which of the following factors can cause brakes to fade or fail?

45 / 50

What pumps air into the air storage tanks?

46 / 50

The ________ system applies and releases the brakes when you use the brake pedal during normal driving

47 / 50

When air tank pressure rises to the "cut-out" level (around __________ or psi), the governor stops the compressor from pumping air

48 / 50

_________ does not necessarily shorten your stopping distance, but it does help you keep the vehicle under control during hard braking

49 / 50

Air brakes are really three different braking systems:

50 / 50

Foundation brakes are used at each wheel. The most common type is the __________ brake.

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The average score is 78%