Air Brakes 1 Quiz – Brewsterstransport

Created on November 04, 2023

Air Brakes 1

1 / 25

When you press the brake pedal,

A) compressed air enters the brake chambers

B) .compressed air is released from the air tanks.

C) compressed air is released from the brake chambers.

2 / 25

Air brakes use _________ to make the brakes work.

A) natural gas

B) compressed air

C) hydraulic fluid

3 / 25

To test the static air leakage rate, you should

A) turn off the engine, release the parking brake, and let the system settle.

B) leave the engine running and release the parking brake.

C) charge the air system and leave the engine running.

4 / 25

During your final air brake check, if the air pressure does not build up fast enough,

A) the air pressure may drop too low during driving.

B) have the problem fixed after your trip is over.

C) the alcohol evaporator may be low.

5 / 25

During normal driving, spring brakes are usually held back by

A) bolts and braces

B) .springs.

C) air pressure.

6 / 25

A typical air brake system is fully charged at

A) 125 psi.

B) 150 psi.7

C) 5 psi.

7 / 25

Excessive use of the service brakes may result in overheating, which can lead to

A) expansion of the brake drums.

B) improper adjustment of the S-cams.

C) increased contact between the brake drums and the brake linings.

8 / 25

Excessive heat caused by overuse of the service brakes can cause

A) the brakes to fade.

B) the modulating control valve to wear out.

C) the brake linings to split.

9 / 25

The air compressor will stop pumping air into the air tanks at ____ psi.

A) 125

B) 100

C) 150

10 / 25

If your vehicle has a properly functioning dual air brake system and minimum-sized air tanks, the air pressure should build from 85 to 100 psi within ____ seconds.

A) 60

B) 20

C) 45

11 / 25

What is the best way to test if your vehicle's spring brakes come on automatically?

A) All of the above are correct.

B) On single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.

C) Continue to step on and off the brake pedal until the manufacturer's low psi specification is met for spring brakes to deploy.

D) On tractor-trailer vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.

12 / 25

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

A) Brakes being out of adjustment

B) Not relying enough on engine braking

C) All of the above

D) Excessive use of the service brakes

13 / 25

An antilock braking system (ABS)

A) activates when your wheels are about to lock up.

B) shortens your stopping distance.

C) increases your normal braking capability.

D) decreases your normal braking capability.

14 / 25

If the air tanks are not drained,

A) your left side brake will cease to operate.

B) you will drive too quickly.

C) your transmission fluid may drain out.

D) your brakes may fail because of water freezing.

15 / 25

Under which conditions are front wheel brakes good?

A) Good weather only

B) None

C) All weather conditions

D) Wet or icy conditions only

16 / 25

Which of the following should you do before leaving your vehicle unattended?

A) Remove the keys.

B) Chock the wheels.

C) Do all of the above.

D) Set the parking brakes.

17 / 25

The braking power of the spring brakes:

A) Depends on the adjustment of the service brakes.

B) Increases when the service brakes are hot.

C) Is not affected by the condition of the service brakes.

18 / 25

What can legally hold a parking or emergency brake in position for a truck, truck tractor or bus?

A) Air pressure

B) Fluid pressure

C) Spring pressure

19 / 25

If your vehicle has an alcohol evaporator, it is there to:

A) .Eliminate the need for daily tank draining

B) Reduce the risk of ice in air brake valves in cold weather.

C) Rid the wet tank of alcohol that condenses and sits at the bottom

20 / 25

Brake lag distance at 55 mph is _____ feet?

A) 23

B) 32

C) 50

21 / 25

To make an emergency stop with air brakes, using the stab braking method, you should:

A) Brake as hard as you can, get off the brakes when the wheels lock, get back on the brakes when the wheels start rolling again

B) Pump the brake pedal rapidly and lightly.

C) .Brake hard until the wheels lock, and then get off the brakes for as much time as the wheels were locked.

22 / 25

The brake system that applies and releases the brakes when the driver uses the brake pedal is the:

A) Service brake system.

B) Emergency brake system.

C) Parking brake system.

23 / 25

Which of the following makes the total stopping distance for air brakes longer than that for hydraulic brakes?

A) Reaction distance.

B) Perception distance.

C) Brake lag distance.

24 / 25

What is the S-cam used for?

A) To test the slack adjusters.

B) To apply the brakes.

C) To release the brakes.

25 / 25

Oil and water usually collect in compressed air tanks. If you do not have an automatic tank drain, when should you drain the air tanks?

A) After every working day.

B) Once a week.

C) After every four hours of service.

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