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
66

CDL Air Brakes Practice Test

1 / 50

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

2 / 50

Which vehicles must have low air pressure warning signals?

3 / 50

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

4 / 50

__________ are most often used for emergency and parking brakes

5 / 50

While driving down long, steep downgrades, your brakes

6 / 50

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

7 / 50

How often should you drain your air tanks?

8 / 50

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

9 / 50

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

10 / 50

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

11 / 50

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

12 / 50

__________ are used to hold compressed air

13 / 50

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

14 / 50

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

15 / 50

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

16 / 50

Air brakes are really three different braking systems:

17 / 50

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

18 / 50

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

19 / 50

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

20 / 50

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

21 / 50

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

22 / 50

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

23 / 50

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

24 / 50

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

25 / 50

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

26 / 50

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

27 / 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.

28 / 50

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

29 / 50

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

30 / 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.

31 / 50

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

32 / 50

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

33 / 50

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

34 / 50

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

35 / 50

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

36 / 50

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

37 / 50

What pumps air into the air storage tanks?

38 / 50

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

39 / 50

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

40 / 50

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

41 / 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

42 / 50

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

43 / 50

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

44 / 50

Front wheel braking is good under all conditions.

45 / 50

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

46 / 50

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

47 / 50

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

48 / 50

Air brakes use __________ to make the brakes work

49 / 50

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

50 / 50

For dual air systems, air pressure should build

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