Air Brakes 2 Quiz – Brewsterstransport

Created on October 30, 2023

Air Brakes 2

1 / 25

When can you leave your truck unattended without first applying the parking brakes or chocking the wheels?

A) If you will only be away from the truck for a few minutes

B) If you will be conducting your pre-trip inspection

C) Never

2 / 25

To test the air service brakes,

A) stop the vehicle, put it in low gear, depress the brake pedal, and then gently pull against the brakes.

B) brake firmly while slowly moving forward.

C) brake firmly while slowly moving backward.

3 / 25

S-cam drum brakes have an S-cam in each brake chamber. Why is it called an "S-cam?"

A) It makes the brake shoes move in an S-shaped path.

B) It is shaped like the letter "S."

C) It is constantly spinning whenever the wheel is spinning.

4 / 25

If oil and water collects in the air tanks, what could happen to the brakes?

A) The brakes could heat up.

B) The brakes could fail.

C) The brakes could lock up.

5 / 25

In controlled braking, you

A) lock the wheels for short periods of time.

B) brake in a straight line.

C) can turn sharply.

6 / 25

Which of the following is the most important thing about hard braking?

A) Never do it without downshifting first.

B) Disconnecting the steering axle brakes will help keep your vehicle in a straight-line during emergency braking.

C) Don't lock the wheels for longer than an instant.

7 / 25

A converter dolly with antilock brakes (ABS) is required to have

A) a white lamp on the left side.

B) a yellow lamp on the left side.

C) a white lamp on the right side.

8 / 25

You'll know that your brakes are fading if

A) the brake feels spongy when you apply pressure.

B) you release the brake pedal and your speed increases.

C) you have to press the brake pedal harder than usual to control your speed.

9 / 25

If the spring brakes are on, when should you push the brake pedal?

A) Never

B) Only when driving downhill

C) Only on a slippery road

10 / 25

Repeatedly pressing and releasing (fanning) the brake pedal may result in

A) no change in brake air pressure.

B) a buildup of brake air pressure.

C) a loss of brake air pressure.

11 / 25

In the event of a brake system failure, the emergency brake system uses __________ to stop the vehicle.

A) parts of the service brakes and parking brakes

B) only the service brakes

C) only the parking brakes

12 / 25

Spring brakes are

A) not going to take full effect until your psi drops to a certain range, typically 20 to 30 psi.

B) brakes that come on automatically on a truck or tractor when the psi drops too low.

C) made up of powerful springs that are held back by air pressure while you are driving.

D) all of the above.

13 / 25

How can you tell if your vehicle is equipped with an antilock braking system (ABS)?

A) Check if the vehicle was manufactured after 2010.

B) Check if the vehicle was manufactured after 1998.

C) Check if the vehicle was manufactured after 2000.

D) ABS is still optional.

14 / 25

Which of the following are true about a dual air brake system?

A) One system is called the "primary" system and the other one is called the "secondary" system.

B) It uses a single set of brake controls.

C) Usually, one system operates the front axle and the other one operates the rear axle.

D) All of the above are true.

15 / 25

Which of the following is not part of the braking process when you're driving a tractor-trailer combination vehicle with an antilock braking system (ABS)?

A) You should use only the braking necessary to stay safely in control.

B) Brake the same way no matter what you're driving: a vehicle with ABS, a vehicle with a trailer, or something else.

C) You should drive faster so that you will be able to keep the trailer and tractor straight.

D) When you slow down, you should monitor your tractor and trailer and ease off the brakes to keep control.

16 / 25

Which of the following will be true about your brake function if your antilock braking system (ABS) fails?

A) It may cause problems with other mechanical systems and possibly pose a huge fire risk.

B) You will still have normal brake function and will just need to get the ABS repaired soon.

C) It will slow your truck to a halt and force you to pull over.

D) You will have no brake function and your truck will be out of control.

17 / 25

The modulating control valve is?

A) A spring-loaded valve that will let you put on the brakes on slowly if the service brakes fail.

B) There is no such thing.

C) Should not be used because it is very unsafe.

18 / 25

When driving down a long steep hill you should:

A) Release the brake when you are 5 mph below your "safe" speed.

B) Use stab braking.

C) Begin braking when you are 10 mph above your safe speed.

19 / 25

The most common type of foundation brakes found on heavy vehicles is the:

A) S-cam brake

B) Disc brakes

C) Wedge drum

20 / 25

The driver must be able to see a warning that is given before air pressure in the service air tanks falls below:

A) 20 psi

B) 40 psi

C) 60 psi

21 / 25

If you must make an emergency stop, you should brake so that you:

A) Use the full power of the brakes and lock them.

B) Stay in a straight line and can steer.

C) Can steer hard while braking hard.

22 / 25

Modern air brake systems combines three different systems. They are the service brakes, the parking brakes and the:

A) S-cam brakes.

B) Foot brakes.

C) Emergency brakes.

23 / 25

Air brake equipped vehicles must have:

A) At least two brake heaters.

B) An air use gauge.

C) A supply pressure gauge.

24 / 25

Of the choices below, the first thing to do when a low air pressure warning comes on is:

A) Stop and safely park as soon as possible.

B) Up shift.

C) Adjust the brake pedal for more travel.

25 / 25

The air compressor governor controls:

A) The speed of the air compressor.

B) Air pressure applied to the brakes.

C) When air is pumped into the air tanks.

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