Air Brake Practice Test 04

The free Air Brake Practice Test provides detailed explanations of the correct answers, allowing you to learn from your mistakes and hone your knowledge in areas where you need extra help. By taking advantage of this valuable tool, you’ll be well-equipped to pass the official air brake test and advance your driving career.


Air Brake Practice Test 04

1 / 30

What is an automatic limiting valve?

2 / 30

Parking brakes should be in what position before making a service brake application?

3 / 30

What should always be done when caging the parking brake spring?

4 / 30

Anytime the reservoir pressure drops to approximately 35 psi, what happens?

5 / 30

Instruction on how to cage is usually found where?

6 / 30

Spring parking brake chambers should never be disassembled without first doing what?

7 / 30

Is the installation of spring parking brakes and their piping arrangements done the same in all vehicle air brake systems?

8 / 30

What is another word for when the spring compresses?

9 / 30

The spring parking brake system can also act as what?

10 / 30

Which statement is false? When parking a vehicle with over heated brakes...

11 / 30

During normal service brake operation, wat happens to the parking brake spring?

12 / 30

Which statement is false? How quickly the spring brakes will stop the vehicle depends on such factors as...

13 / 30

Some systems may have an additional valve controlled by a blue button that applies what?

14 / 30

What can be accomplished by installing a control valve in the cab and a front brake limiting valve on the front axle?

15 / 30

What should the brake chamber be fitted with to ensure debris will not enter the chamber?

16 / 30

The control valve is set in what position for dry road surfaces?

17 / 30

What is the danger of disassembling a spring parking brake unit?

18 / 30

What happens to allow reservoir air pressure to flow to the spring parking brake chambers?

19 / 30

On the pre-trip air brake inspection, you must ensure that the parking brake spring is not...

20 / 30

The effectiveness of the spring parking brake depends on what?

21 / 30

What is meant by compounding?

22 / 30

With an automatic limiting valve, brake applications between 40 psi and 60 psi are reduced to...

23 / 30

How many uses does the relay valve have?

24 / 30

. In the spring parking brake system, the brakes are applied by spring pressure and retracted by what?

25 / 30

How are the brakes caged?

26 / 30

when the brake drum has expanded because of extreme heating, when the brake drum starts to cool and contract, the pressure exerted by the spring parking brake may cause the brake drum to do what?

27 / 30

After overheating the brake drums, when should you set the spring parking brake?

28 / 30

Some spring parking brakes can be released mechanically by doing what?

29 / 30

Where does the air in the control line 'dead end' to?

30 / 30

Disassembly of a spring brake chamber should be done by...

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