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South Dakota
South Dakota CDL Air Brakes 2
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Q.1
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Anti-Lock Braking Systems (ABS):
Reduce a vehicle's normal braking capacity.
Are in addition to other braking systems and do not reduce a vehicle's braking power.
Are not effective on larger vehicles.
Q.2
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On a truck with air brakes, the braking system’s air compressor:
Pumps air into the air storage tanks.
Fills the tires.
Moves air to the back of the truck.
Cleans the brakes.
Q.3
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Alcohol evaporators are:
Illegal.
Used to add alcohol to braking systems to prevent items from freezing.
Only allowed on vehicles carrying hazardous materials.
Q.4
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Air pressure should build up in a single air system within:
15 minutes.
12 minutes.
Three minutes.
One minute.
Q.5
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In a dual air brake system:
Air tanks are shared by both systems.
Each system has its own air tanks.
You must designate which system you are using.
Brakes on only one side of the vehicle will work.
Q.6
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Air tank drains:
Allow rain water to enter air tanks.
Are used to drain water and oil from air tanks.
Should never be opened.
Must remain open while driving.
Q.7
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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.8
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When experiencing cold weather, be sure to check your vehicle's alcohol evaporator:
Every three hours.
Every day.
Every other week.
Q.9
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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.10
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A modulating control valve can control the:
Spring brakes.
Landing gear.
Air brakes.
Anti-lock braking system (ABS).
Q.11
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During an applied leakage test, the maximum leakage rate for a triple combination vehicle is ____ in a minute.
2 psi
4 psi
6 psi
Q.12
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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.13
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A ____ allows a driver to gradually apply spring brakes.
Modulating control valve
Trailer air supply control
Relay valve
Q.14
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Brakes out of adjustment will:
Work properly.
Cause some of the brakes to overwork and malfunction.
Allow better acceleration.
Q.15
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A low air pressure warning signal:
Is not required on vehicles with air brakes.
Is required on vehicles with air brakes.
Is optional on vehicles with air brakes.
Q.16
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A driver can rely on front wheel braking to work:
On dry roadways only.
Under all conditions.
Under all conditions, except for snow.
Q.17
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Brake fading is caused when:
Brakes are not used often enough.
Brakes overheat.
Brakes are too cold.
Brakes are wet.
Q.18
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You should ____ if the low pressure warning signal activates while you are driving.
Stop where you are and park
Exit the roadway as soon as safely possible
Continue driving normally
Q.19
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What can happen if a parking brake is used in very wet weather when temperatures are below freezing?
The brakes will squeak.
The brakes may freeze so the vehicle cannot move.
The brakes may suddenly release by themselves.
The brakes may explode.
Q.20
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A vehicle equipped with an Anti-Lock Braking System (ABS) uses a ____ light to warn that the system is not working properly.
Green
Yellow
Orange
White
Q.21
Submit
When the brake pedal is depressed, air brakes work:
Immediately.
After a short delay.
After about a minute.
Only if the green lever on the control panel is pushed down.
Q.22
Submit
You must have an air brake endorsement:
To use a vehicle with air brakes.
To drive any truck with a trailer.
To transport hazardous materials.
Q.23
Submit
Braking mechanisms are located ____ a brake drum.
Outside
Inside
Next to
On top of
Q.24
Submit
During an applied leakage test, the maximum leakage rate for a triple combination vehicle is:
10 psi in a minute.
8 psi in a minute.
6 psi in a minute.
4 psi in a minute.
Q.25
Submit
Why should you regularly drain the air tanks?
Because the air gets old and needs to be replaced
Because compressed air contains some water and the water collects in the tanks
To allow for a change in pressure
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