Air Brakes 3 Quiz – Brewsterstransport

Created on October 30, 2023

Air Brakes 3

1 / 25

The modulating control valve allows you to control the

A) amount of pressure in the brake system.

B) front brakes.

C) spring brakes.

2 / 25

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

A) 60 to 80 psi.

B) 20 to 45 psi.

C) 10 to 15 psi.

3 / 25

If you need to stop quickly and your vehicle lacks antilock brakes, you can use

A) the "stab braking" method.

B) either of the above.

C) the "controlled braking" method.

4 / 25

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

A) Not pressing the brake pedal hard enough

B) Not taking your foot off the accelerator

C) Overheating, low air pressure, and not relying on the engine braking effect

5 / 25

In which of the following situations should you NOT apply the parking brakes?

A) If the brakes are very hot

B) If you're parking for less than one hour

C) When you are testing whether they will hold the vehicle

6 / 25

With S-cam drum brakes, when the brake chamber fills with air, air pressure pushes the push rod out, moving the ________ and thus rotating the ________.

A) brake camshaft; tie rod

B) slack adjuster; tie rod

C) slack adjuster; brake camshaft

7 / 25

If your vehicle has an alcohol evaporator, every day during cold weather you should:

A) Check and fill the alcohol level.

B) Change the alcohol from a new bottle.

C) Clean the air filter with alcohol

8 / 25

Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?

A) Continue at normal speed and find a garage before the brakes lock.Stop.

B) Safely park and continue only after the system is fixed.

C) Reduce your speed and drive to the nearest garage for repairs.

9 / 25

To check the free play of manual slack adjusters on S-cam brakes you should:

A) Stop on level ground and apply the parking brakes.

B) Park on level ground, chock the wheels, and release the parking brakes.

C) Park on level ground and drain off air pressure before adjusting.

10 / 25

Modern air brake systems are three different systems combined: the service brakes, parking brakes, and _______ brakes.

A) foot

B) S-cam

C) emergency

11 / 25

Under ideal conditions, the average driver of a truck or bus equipped with air brakes and traveling at 55 mph would require what stopping distance?

A) 100 to 250 feet

B) More than 400 feet

C) 300 to 350 feet

12 / 25

Your vehicle has a dual air brake system. One of the systems loses air pressure. What will happen?

A) Either the front or rear brakes will not be fully operational.

B) The manual slack adjusters will not be set properly.

C) The emergency brakes will come on immediately.

13 / 25

If the low air pressure warning signal is not working,

A) neither of the above will happen.

B) you may lose air pressure, but at least you'll know about it anyway.

C) it may lead to sudden emergency braking in a single-circuit air system.

14 / 25

The parking brake control

A) applies the brakes during normal driving.

B) lets the air out of the brake chambers.

C) applies the brakes in the event of an emergency.

15 / 25

How would you check your truck's slack adjusters?

A) All of the above will work.

B) Press the brake pedal while listening for any strange noises.

C) Accelerate, then brake hard.

D) Use gloves and pull hard on each slack adjuster you can reach.

16 / 25

How do brakes work on a long, steep downgrade?

A) They work as a supplement to the braking effect of your engine.

B) They work as the main braking mechanism with the engine braking effect as an emergency backup.

C) They work as the main braking mechanism.

D) Not applicable; no braking effect is involved in a downgrade.

17 / 25

After the initial drop, the maximum acceptable leakage rates per minute are

A) 5 psi for single vehicles and 10 psi for combination vehicles.

B) 5 psi for single vehicles and 6 psi for combination vehicles.

C) 3 psi for single vehicles and 4 psi for combination vehicles.

D) 1 psi for single vehicles and 3 psi for combination vehicles.

18 / 25

Brake drums must not have cracks longer than _____ the width of the friction area?

A) 1/8

B) 1/4

C) 1/2

19 / 25

During normal driving, spring brakes are usually held back by:

A) Air pressure

B) Centrifugal force

C) Spring pressure

20 / 25

Why drain water from the compressed air tanks?

A) Water can freeze in cold weather and cause brake failure.

B) The low boiling point of water reduces braking power.

C) Water over cools the compressor.

21 / 25

If the air compressor should develop a leak, what keeps the air in the tanks?

A) The one-way check valve

B) The emergency relay valve

C) The tractor protection valve

22 / 25

The application pressure gauge shows the driver how much pressure:

A) Has been used on the trip.

B) Is in the air tanks.

C) Is being applied to the brakes.

23 / 25

You should know that your brakes are fading when:

A) Pressure on the brake pedal is released and speed increases.

B) You must push harder on the brake pedal to control your speed on a downgrade.

C) The brake feels spongy when pressure is applied.

24 / 25

The brake pads should be _____ for the brakes to be on?

A) Against the drum.

B) Worn 1/32 of an inch.

C) Worn dangerously thin.

D) Disconnected from the slack adjusters.

25 / 25

If your truck or bus has dual parking control valves it means that you can use pressure from a separate tank to:

A) Release the spring brakes to move a short distance.

B) Apply more brake pressure if the main tank is getting low.

C) Stay parked without using up service air pressure.

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