An effective tool for stopping large vehicles.

Only effective in poor weather.

A tool to improve fuel efficiency.

A tube used to move air from the compressor to the tanks

A noise made by air brakes when used

A part within the braking unit that allows air to move freely

South Carolina CDL Air Brakes 1 - DMV Written Test Questions with Answers

Q.1

To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:

Set the control to normal.
Set the control to the off position.
Set the control to neutral.
Keep the control at the halfway mark.

Q.2

When leaving a vehicle unattended, a driver should:

Always set the parking brake.
Only set the parking brake if the vehicle is parked on a slope.
Deflate the tires by 10 percent.

Q.3

When a brake pedal is pressed and the S-cam is turned, the S-cam:

Presses the brake shoes against the inside of the brake drum.
Tightens the brake drum onto the axle.
Presses the brake lining against the wheel.
Releases air from the air tanks.

Q.4

Foundation brakes are used:

Only at the front wheels.
Only at the rear wheels.
Only at the driver’s side wheels.
At each wheel.

Q.5

While operating on a downgrade, you should brake until you reach a speed that is:

5 mph below your safe speed.
10 mph below your safe speed.
15 mph below your safe speed.

Q.6

Brakes can get out of adjustment quickly, especially:

If they are hot.
In the winter time.
If they are used frequently.

Q.7

If the low pressure warning light comes on while you are driving:

Braking will only be possible if there is still enough air in the tanks.
You can apply the brakes 14 times before the air in the system runs out.
You should continue to drive normally and check the brake system when it is convenient.
You should stay at least 100 feet away from other vehicles.

Q.8

____ make up the emergency brake system.

Only parts of the parking brake system
Only parts of the service brake system
Parts of the parking and service brake systems

Q.9

What kind of force must emergency brakes use?

Air pressure
Mechanical
Heavy
Electrical

Q.10

Air brakes are:

An effective tool for stopping large vehicles.
Prohibited on large vehicles.
Only effective in poor weather.
A tool to improve fuel efficiency.

Q.11

During an inspection, slack adjusters on S-cam brakes should not move more than:

One foot.
One centimeter.
One inch.

Q.12

What is a wig wag?

A type of warning system
A tube used to move air from the compressor to the tanks
A noise made by air brakes when used
A part within the braking unit that allows air to move freely

Q.13

Using the brakes creates heat. If too much heat is produced:

The brakes may not work.
The brakes may squeak more than usual.
The brakes will brake unevenly.

Q.14

What do the two systems of a dual air brake system share?

Hoses
An air compressor
Air tanks

Q.15

What do air brakes use to make the brakes work?

Compressed air
Outside air
Non-compressed air

Q.16

During a walk-around inspection, ensure there are no cracks on the brake drums that are more than ____ of the width of the friction area.

One half
One quarter
One third
One tenth

Q.17

Why do you need to drain air tanks regularly?

Because the air gets old and needs to be replaced
Because compressed air contains some water which must be drained from the tanks
To allow for a change in air pressure
To remove bad air from the tanks

Q.18

The most common type of foundation brake used is the:

S-cam drum brake.
C-cam drum brake.
G-cam disc brake.
P-cam disc brake.

Q.19

To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:

Set the control to normal.
Set the control to the off position.
Set the control to the neutral position.

Q.20

If using air tanks with manually operated drains, how often should you drain the tanks?

Every day
Once a week
Once a month
Once every 3,000 miles

Q.21

You should test the low pressure warning signal by:

Turning on the engine and applying the trailer hand brake.
Rapidly pressing and releasing the brake pedal.
Removing wheel chocks and disengaging the parking brake.

Q.22

A ____ allows a driver to gradually apply spring brakes.

Modulating control valve
Trailer air supply control
Relay valve

Q.23

In a dual air brake system, a leak in one system:

Always means there are leaks in both systems.
May not affect the other system.
Is not something to worry about.
Will also affect the other system.

Q.24

Water and compressor oil are usually found in the compressed air within an air brake system. Water and compressor oil:

Are necessary for the proper function of the air brake system.
Should be added if low.
Should be removed regularly.
Are not concerns.

Q.25

In a newer vehicle, you apply the parking brake:

By using a diamond-shaped yellow knob.
By using a round red knob.
By using a square green knob.
By using a black round knob.

To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:

When leaving a vehicle unattended, a driver should:

When a brake pedal is pressed and the S-cam is turned, the S-cam:

Foundation brakes are used:

While operating on a downgrade, you should brake until you reach a speed that is:

Brakes can get out of adjustment quickly, especially:

If the low pressure warning light comes on while you are driving:

____ make up the emergency brake system.

What kind of force must emergency brakes use?

Air brakes are:

During an inspection, slack adjusters on S-cam brakes should not move more than:

What is a wig wag?

Using the brakes creates heat. If too much heat is produced:

What do the two systems of a dual air brake system share?

What do air brakes use to make the brakes work?

During a walk-around inspection, ensure there are no cracks on the brake drums that are more than ____ of the width of the friction area.

Why do you need to drain air tanks regularly?

The most common type of foundation brake used is the:

To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:

If using air tanks with manually operated drains, how often should you drain the tanks?

You should test the low pressure warning signal by:

A ____ allows a driver to gradually apply spring brakes.

In a dual air brake system, a leak in one system:

Water and compressor oil are usually found in the compressed air within an air brake system. Water and compressor oil:

In a newer vehicle, you apply the parking brake:

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