Colorado CDL Air Brakes 2 - DMV Written Test Questions with Answers - MCQGeeks.com

Q.1

If the spring brakes are activated, you should never:

Push down the brake pedal.
Open the hood.
Release air from the air storage tanks.
Open the door to the cab.

Q.2

The application pressure gauge:

Shows how much air pressure is being applied to the brakes.
Shows the temperature of air being used in the braking system.
Shows the pressure of the air coming from the compressor.
Shows the number of times the brakes have been used.

Q.3

Where is the safety relief valve usually located?

Near the rear brake
Near the front brake
In an air tank
On the dashboard

Q.4

Friction inside a brake drum is caused when the brake shoes and linings:

Push against each other.
Separate from the axle.
Push against the inside of the drum.
Create excess heat.

Q.5

In a dual air brake system:

Each system has separate air tanks, hoses, and lines.
The systems share air tanks, but each has its own separate hoses and lines.
Each system uses the same lines and hoses.
One system is the main braking system and a second system is ready to be used if the first one fails.

Q.6

What can happen if the air pressure gets too low in an air brake system?

The brakes may squeak.
The brakes may not work.
The brakes may be sluggish.
The brakes will be very sensitive.

Q.7

Most heavy-duty vehicles use:

Single air brake systems.
Dual air brake systems.
Triple air brake systems.
Quadruple air brake systems.

Q.8

How many air storage tanks are used in an air brake system?

Two tanks
Four tanks
Six tanks
The number varies.

Q.9

Spring brakes come on:

When too much air pressure is lost.
When a control on the dashboard is activated.
When the tires have minimal tread depth.
When the brakes are noisy.

Q.10

A dual air brake system:

Has a single air brake system, but uses two sets of controls.
Has one air brake system for each side of the truck.
Has two brakes for each wheel.
Has two separate air brake systems, but uses a single set of controls.

Q.11

When only the tractor is equipped with an Anti-Lock Braking System (ABS):

There is a decreased risk of jackknifing.
There is an increased risk of jackknifing.
The brakes will not work as effectively as they would without ABS.
The brakes will become more sensitive.

Q.12

During a static leakage test, the maximum leakage rate for a single vehicle with air brakes is ____ in one minute.

1 psi
2 psi
3 psi
4 psi

Q.13

How is the parking brake released?

By tapping on the brake pedal three times
By pushing in the brake control knob
By engaging the accelerator
By tapping the accelerator twice

Q.14

Front brake limiting valves were intended to:

Prevent the front tires from skidding.
Prevent the front tires from overheating.
Create equal brake usage.
Remove uncertainty when applying the brakes.

Q.15

If the spring brakes are on, you should:

Not use the brake pedal.
Press the accelerator.
Move the steering wheel.
Be especially careful because the brakes may fail.

Q.16

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.17

To inspect slack adjusters on S-cam brakes, you need to:

Park on a hill and test the brakes.
Put on gloves and push in the slack adjusters.
Remove the drum and look inside.
Chock the wheels and disengage the parking brake.

Q.18

To confirm that a trailer has ABS, you can:

Look under the trailer for wheel speed sensors coming from the back of the brakes.
Look under the hood for the ABS sticker.
Look at the tires.
Remove a tire and look for the ABS sensor on the axle.

Q.19

All air tanks must include:

A drain valve.
A lock.
A trap door.
A warning sticker.

Q.20

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.21

During a static leakage test, the maximum leakage rate for a double combination vehicle is:

3 psi in one minute.
6 psi in one minute.
8 psi in one minute.
4 psi in one minute.

Q.22

Front wheel braking works:

Only on packed snow.
Under all conditions.
Only if the road is dry.
Under most conditions.

Q.23

Which of the following is not a part of an air brake system?

A service brake system
A parking brake system
An emergency brake system
An axle brake system

Q.24

In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:

You will be unable to move the vehicle.
A separate air tank can be used to release the spring brakes for a short period of time.
You can use the spring brakes to continue driving normally.
The air tanks will automatically refill to a safe air pressure level.

Q.25

Air tank drains:

Allow rain water to enter the tank.
Are used to drain water and compressor oil from the air tank.
Should never be opened.
Must remain open during transit.

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