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Arkansas
Arkansas CDL Air Brakes 2
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Q.1
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If the low air pressure warning signal comes on, you should:
Continue driving, but have the brakes repaired within a week.
Pull over and inspect the brakes.
Phone a mechanic while driving.
Q.2
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What do air brakes use to make the brakes work?
Compressed air
Outside air
Non-compressed air
Q.3
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Emergency brakes:
Are not required on trucks.
Are only required on trailers.
Are required on tractors.
Are optional.
Q.4
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The safety valve located on the first tank opens:
Regularly.
If there is too little pressure.
If there is too much pressure.
After every stop.
Q.5
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To make a stop in a vehicle equipped with air brakes, the driver should:
Press the brake pedal down.
Lift the brake pedal up.
Pull out the air brake knob.
Q.6
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Using an Anti-Lock Braking System (ABS):
Shortens stopping distance.
Shortens brake response time.
Provides less control.
Provides more control.
Q.7
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To use the stab braking method, you should:
Apply the brakes completely until the wheels lock up, release the brakes until the wheels start rolling, then repeat the process.
Apply the brakes about halfway, but allow the wheels to keep rolling.
Apply the brakes completely until the wheels lock up and the vehicle stops.
Apply the emergency brake until the vehicle starts to slow.
Q.8
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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.
Q.9
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What color are ABS malfunction lamps?
Orange
Yellow
Green
Blue
Q.10
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Before driving a vehicle with air brakes, you should ensure that the ____ come on automatically when air pressure falls below 45 psi.
Spring brakes
Parking brakes
Air brakes
Q.11
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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.12
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What happens if brakes become too hot?
They will become too smooth.
They will harden.
They may stop working.
The air compressor will kick in to cool the brakes
Q.13
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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.14
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A modulating control valve can control the:
Spring brakes.
Landing gear.
Air brakes.
Anti-lock braking system (ABS).
Q.15
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What must be on an air tank in an air-braked vehicle?
A check valve
A lock
A trap door
An oxidizer
Q.16
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Before a vehicle with dual air brakes is driven, pressure of at least ____ should be built up in both braking systems.
10 psi
25 psi
50 psi
100 psi
Q.17
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If the air pressure warning light comes on, you should:
Continue driving normally.
Activate your hazard lights and continue driving.
Call the local law enforcement agency.
Safely exit the roadway and stop.
Q.18
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On newer vehicles, how do you put on the parking brake?
Move a lever to the right.
Push in the yellow, diamond-shaped knob.
Pull out the yellow, diamond-shaped knob.
Pull up on the steering column.
Q.19
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An air compressor governor will stop the compressor from pumping air once the air tanks have an air pressure level of:
125 psi.
100 psi.
150 psi.
80 psi.
Q.20
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Air tank drains:
Allow rain water to enter the tanks.
Are used to drain water and oil from the tanks.
Should never be opened.
Must remain open while driving.
Q.21
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Before driving a vehicle with a dual air brake system, you must wait for the air compressor to build a minimum of ____ in both the primary and secondary systems.
25 psi
50 psi
75 psi
100 psi
Q.22
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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.23
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A tank endorsement is:
Only required when transporting gases.
Only required when transporting liquids.
Required to transport both liquids and gases.
Optional when transporting hazardous materials.
Q.24
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Most heavy-duty vehicles use:
Single air brake systems.
Dual air brake systems.
Triple air brake systems.
Quadruple air brake systems.
Q.25
Submit
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 six months
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