Minnesota Free Online (MN) CDL Practice Test

324 questions

Your brakes are fading when:

You have to push harder on the brake pedal to control your speed on a downgrade.

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The brake system that applies and releases the brakes when the driver uses the brake pedal is the ______ brake system.

Service

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Your truck or bus has a dual air brake system. What should you do if a low air pressure warning comes on for only one system?

Stop right away and park. Continue only after the system is fixed

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During normal driving, spring brakes are usually held back by:

Air pressure

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Total stopping distance for air brakes is longer than for hydraulic due to _______ distance.

Brake lag

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In air brake equipped trucks, the parking brake should be used:

Whenever you leave the vehicle unattended

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For emergency stab braking you should:

Press on the brake pedal as hard as you can, release the brake when the wheels lock, and when wheels start rolling put the brake on fully again.

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Parking or emergency brakes of trucks and buses can be legally held on by ______ pressure.

Spring

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The driver must be able to see a low air pressure warning which comes on before the pressure in the service air tanks falls below ___ PSI.

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If your vehicle has an alcohol evaporator, it is there to:

Reduce the risk of ice in air brake valves in cold weather

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The brake pedal in an air brake system:

Control the air pressure applied to put on the brakes

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To check the free play of manual slack adjusters os S-cam Brake, you should park on:

Level ground, chock the wheels and release the parking brake.

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The most important thing to do when a low air pressure warning comes on is:

Stop and safely park as soon as possible

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The air compressor governor controls:

When air is pumped into the air tanks

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The braking power of the spring brakes:

Depends on the service brakes being in adjustment

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The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:

Spring pressure.

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A straight truck or bus air brake system should not leak at the rate of more than __PSI per minute with the engine off and the brakes released

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Air brake takes more time that hydraulic braking because of air ___

takes more time to flow through the lines than hydraulic fluid

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Modern air brake systems combine three different systems. They are the service, the parking, and the _____ brakes.

emergency

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The application pressure gauge shows how much air pressure you:

Are applying to the brakes

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If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks?

At the end of each day of driving

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The proper use of the brake when going down a long steep grade after selection a proper gear is to brake until your speed is above ___ MPH below the posted speed for safety and release you brake.

5 mph

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If the air pressure did not reach the correct level during the allowed time, then:

Your pressure may drop to the low point while driving, requiring an emergency stop

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The air brake lag distance at 55 mph on dry pavement adds about ____ feet.

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A slack adjuster's free play needs to be adjusted if it is more than about ______ when you pull hard on it.

1 inch

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Some air brake systems have an alcohol evaporator. What may happen if you don't keep the proper level of alcohol?

Ice may form in the air storage tank and cause a brake failure

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The spring brakes used on the chambers in a straight truck will bring you to stop when air pressure drops below ___ PSI

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When should you push the brake pedal if the spring brakes are on?

Never

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If your truck has a properly functioning dual air brake system and minimum size air tank pressure should build up from 85 to 100PSI within how many seconds?

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In ideal conditions, a truck or a bus with an air brake going at 55 mph would require stopping distance of how many feet?

More than 300 feet

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When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?

Never

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It is accepted that too much heat caused by using your brakes too often can also cause:

Brake to fade or fail

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S-cam

Force the brake shoes against the inside of the brake drum

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The stoplight switch:

Turn on your brake light to warn drivers behind you

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When brakes are applied the brake shoes will align to press against the:

Brake drum or disk

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Repeatedly partially releasing and pressing the brake pedal may result in:

A loss of brake air pressure

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Your truck has a dual air system, and one of the systems loses its pressure. What will happen?

Either the front or the back brake will not be fully operational

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An air brake system is fully charged at what PSI?

125

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It is not safe to drive a vehicle that has brake drums with cracks that are longer than ___ of the width of the friction area?

1/2

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How should you check that your service brakes are working properly?

Park on level ground wait until normal air pressure reached, release the parking brake and move forward slowly at about 5mph. Then apply the brakes firmly using the brake pedal

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Minnesota CDL practice test, (MN) free CDL practice test - List of Questions

324 questions

Your brakes are fading when:

The brake system that applies and releases the brakes when the driver uses the brake pedal is the ______ brake system.

Your truck or bus has a dual air brake system. What should you do if a low air pressure warning comes on for only one system?

During normal driving, spring brakes are usually held back by:

Total stopping distance for air brakes is longer than for hydraulic due to _______ distance.

In air brake equipped trucks, the parking brake should be used:

For emergency stab braking you should:

Parking or emergency brakes of trucks and buses can be legally held on by ______ pressure.

The driver must be able to see a low air pressure warning which comes on before the pressure in the service air tanks falls below ___ PSI.

If your vehicle has an alcohol evaporator, it is there to:

The brake pedal in an air brake system:

To check the free play of manual slack adjusters os S-cam Brake, you should park on:

The most important thing to do when a low air pressure warning comes on is:

The air compressor governor controls:

The braking power of the spring brakes:

The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:

A straight truck or bus air brake system should not leak at the rate of more than __PSI per minute with the engine off and the brakes released

Air brake takes more time that hydraulic braking because of air ___

Modern air brake systems combine three different systems. They are the service, the parking, and the _____ brakes.

The application pressure gauge shows how much air pressure you:

If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks?

The proper use of the brake when going down a long steep grade after selection a proper gear is to brake until your speed is above ___ MPH below the posted speed for safety and release you brake.

If the air pressure did not reach the correct level during the allowed time, then:

The air brake lag distance at 55 mph on dry pavement adds about ____ feet.

A slack adjuster's free play needs to be adjusted if it is more than about ______ when you pull hard on it.

Some air brake systems have an alcohol evaporator. What may happen if you don't keep the proper level of alcohol?

The spring brakes used on the chambers in a straight truck will bring you to stop when air pressure drops below ___ PSI

When should you push the brake pedal if the spring brakes are on?

If your truck has a properly functioning dual air brake system and minimum size air tank pressure should build up from 85 to 100PSI within how many seconds?

In ideal conditions, a truck or a bus with an air brake going at 55 mph would require stopping distance of how many feet?

When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?

It is accepted that too much heat caused by using your brakes too often can also cause:

S-cam

The stoplight switch:

When brakes are applied the brake shoes will align to press against the:

Repeatedly partially releasing and pressing the brake pedal may result in:

Your truck has a dual air system, and one of the systems loses its pressure. What will happen?

An air brake system is fully charged at what PSI?

It is not safe to drive a vehicle that has brake drums with cracks that are longer than ___ of the width of the friction area?

How should you check that your service brakes are working properly?

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