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Michigan
Michigan CDL Air Brakes 1
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Q.1
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An application pressure gauge shows:
How much air pressure is being applied to the brakes.
How much air pressure is available.
How much air pressure is required to stop a vehicle.
Q.2
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The ____ are activated by an electric switch that is triggered by the brake pedal.
Headlights
Turn signals
Brake lights
Q.3
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What should happen before the air pressure in an air brake system tank falls below 55 psi?
The warning light should activate.
The vehicle will be unable to shift out of gear.
The front lights should flash.
Q.4
Submit
When stopping in an emergency situation, you should:
Veer your trailer to the right and stop.
Stop in a straight line.
Veer your trailer to the left and stop.
Q.5
Submit
What kind of brakes do most newer heavy-duty trucks use?
Single air brakes
Dual air brakes
Triple air brakes
Q.6
Submit
Friction in an S-cam brake is caused when the brake shoes and linings:
Press against the outside of the brake drum.
Press against the inside of the brake drum.
Push against each other.
Q.7
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The rods in S-cam brakes move the slack adjusters when air pressure is added to the brake chambers. This air pressure is added to the chambers when the driver:
Presses the brake pedal.
Uses the emergency brake.
Uses the trailer hand valve.
Q.8
Submit
Brakes can get out of adjustment quickly, especially:
If they are hot.
In the winter time.
If they are used frequently.
Q.9
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The leakage rate for a triple combination vehicle with air brakes should be no more than ____ in one minute during a static leakage test.
8 psi
5 psi
3 psi
Q.10
Submit
The air compressor is connected to the:
Transmission.
Engine.
Radiator.
Q.11
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When operating a vehicle with a dual air brake system, the driver should:
Let the vehicle warm up before driving to ensure that the fuel reaches the engine.
Let the air compressor build up a minimum of 100 psi pressure in the primary and secondary systems before driving.
Begin driving just after the vehicle starts.
Q.12
Submit
Once the air tanks are at an air pressure level of 125 psi, the air compressor governor will:
Stop the compressor from pumping air.
Release air from the tanks.
Begin pumping air into the tanks.
Q.13
Submit
During an inspection, slack adjusters on S-cam brakes should not move more than:
One foot.
One centimeter.
One inch.
Q.14
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What do air brakes use to make the brakes work?
Compressed air
Outside air
Non-compressed air
Q.15
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The air storage tanks:
Hold only enough air for one braking cycle.
Hold enough air for the brakes to be used several times if the compressor stops working.
Do not hold air unless there is an emergency.
Q.16
Submit
Brakes out of adjustment will:
Work properly.
Cause some of the brakes to overwork and malfunction.
Allow better acceleration.
Q.17
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What do the two systems of a dual air brake system share?
Hoses
An air compressor
Air tanks
Q.18
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What is often found in compressed air?
Water
Cardboard
Brake fluid
Q.19
Submit
In a dual air brake system, if one air system is very low on pressure:
None of the brakes will work at all.
Either the front or rear brakes will not be fully operable.
There is usually no noticeable effect.
Q.20
Submit
When parked on a flat surface, you should:
Use wheel chocks to prevent your vehicle from moving.
Not use wheel chocks.
Use wheel chocks, but only if you have applied the parking brake.
Q.21
Submit
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.22
Submit
Air tank drains:
Should not be used in cold weather.
Are helpful to remove water and oil from the air tanks.
Are used to move air to the brakes.
Q.23
Submit
What color light indicates a vehicle's ABS is not working?
Green
Blue
Yellow
Q.24
Submit
A dual air brake system:
Consists of two separate air brake systems that share a single set of controls.
Is a single air brake system with two different sets of controls.
Consists of one air brake system for the left side of the truck and one system for the right side of the truck, each with its own set of controls.
Q.25
Submit
Braking mechanisms are located inside:
The fifth wheel.
A brake drum.
The landing gear.
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