FREE Air Brake Questions and Answers

Question 1

What produces the air necessary for an air brake system to function?

Accepted Answer

Under-hood compressor

Answer

External compressor

Answer

Recumbent air pressure

Answer

Pre-compressed cylindered air

Question 2

What is the typical operating pressure range of air brake systems?

Accepted Answer

105-125 PSI

Answer

90-100 PSI

Answer

180-200 PSI

Answer

50-90 PSI

Question 3

When should the low-pressure warning system activate?

Accepted Answer

60 PSI

Answer

30 PSI

Answer

10 PSI

Answer

50 PSI

Question 4

In a hand-pull test, how much push rod travel is necessary for the brakes to work?

Accepted Answer

1/2 inch

Answer

1/4 inch

Answer

1 inch

Answer

3/4 inch

Question 5

What is the name for using the parking brakes or "spring" in an emergency?

Accepted Answer

Dynamiting

Answer

Travelling

Answer

Exploding

Answer

Engaging

Question 6

What would happen if your service line burst while you were towing a trailer with air brakes?

Accepted Answer

Nothing, unless you made a service brake application

Answer

Your brakes would become ineffective

Answer

Your tractor would lose all air pressure from the reservoirs

Answer

Your trailer brakes would make an emergency application

Question 7

What would happen if you were towing a trailer and the supply line burst?

Accepted Answer

Spring brakes would make an emergency application

Answer

Nothing

Answer

Tractor spring brakes would make an emergency application

Answer

Tractor would lose all air pressure from the secondary reservoir

Question 8

How can one minimize brake lag and apply the brakes more quickly by keeping an air supply close to the rear service brakes?

Accepted Answer

Relay valve

Answer

Supply valve

Answer

Rear reservoir

Answer

Automatic slack adjuster

Question 9

What happens with a dual circuit air brake system if the air supply to the primary reservoir is cut off?

Accepted Answer

The vehicle will still have braking power

Answer

The tractor brakes will dynamite

Answer

The vehicle will not have any braking power

Answer

The tractor protection valve will not allow the reservoir to lose any pressure

Question 10

What stops air from returning to the compressor from the reservoir?

Accepted Answer

One way check valve

Answer

Tractor protection valve

Answer

Two way check valve

Answer

Relay emergency valve