CDL Air Brakes Study Guide #4

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Emergency controlled braking is when you: *

1 point

Apply the brakes as hard as you can without locking the wheels

Brake as hard as you can, release the brakes when the wheels lock, and put the brakes back on again when the wheels start rolling

Apply the hand valve for one second, then push hard on the brake pedal

Both systems run off of the same air compressor, so if one air compressor malfunctions you will not be able to build or maintain pressure in either system. *

1 point

True

False

If air pressure is NOT built up fast enough within the correct amount of time: *

1 point

You should be ready to use your parking brakes to stop

The alcohol container by be low

Your air pressure may drop too low during driving

When performing your air brake leak-down test your engine should be turned off. *

1 point

True

False

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

1 point

Upshift

Downshift

Stop and safely park as soon as possible

If your vehicle has an alcohol evaporator you should check and fill the alcohol level every day during cold weather. *

1 point

True

False

To test the air service brakes you should: *

1 point

Stop the vehicle, put it in low gear, depress the service brake, and then gently pull against the brakes

Brake firmly while slowly moving backwards

Brake firmly while slowly moving forward

The brake chamber fills with air pushing the rod out, which moves the _______ ________, which twists the ________ __________. *

1 point

Brake camshaft and tie rod

Slack adjuster and tie rod

Slack adjuster and brake camshaft

If you are away from your vehicle for only a short time you don’t need to use the parking brake. *

1 point

True

False

How can you check the slack adjuster? *

1 point

Park on level ground, turn off parking brakes, pull hard on each slack adjuster. It shouldn’t move more than one inch

Park on level ground, turn off parking brakes, and press brake pedal

Park on an incline and see if the vehicle rolls

In air brake vehicles, the parking brake should be used: *

1 point

As little as possible

Any time the vehicle is parked

To hold your speed when going downhill

What are the maximum leakage rates? *

1 point

Less than 4 PSI in one minute for single vehicles and less than 8 PSI in one minute for combination vehicles

Less than 2 PSI in one minute for single vehicles and less than 3 PSI in one minute for combination vehicles

Less than 6 PSI for all vehicles

The proper method of braking when going down a long and/or steep grade after selecting the proper gear, is to brake until your speed is about ___ mile per hour below your “safe” speed, then release your brakes. *

1 point

What are the slack adjusters? *

1 point

It is the space between the back wheels

It is an adjusting nut on the backside of the brake drum used for adjusting the brakes

It is an adjusting nut under the cab to adjust the springs

When is it okay to leave your truck unattended without applying parking brakes or chocking the wheels? *

1 point

If you will only be away from the truck for a few minutes

Never

If you are conducting your pre-trip inspection

Your bus or truck has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do? *

1 point

Reduce your speed and drive to the nearest garage for repairs

Reduce your speed and test the remaining system while driving

Stop and safely park. Continue only after the system is fixed

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

1 point

From 100 to 250 feet

Less than 100 feet

More than 300 feet

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 point

1/2

1/4

1/32

How can you test the low pressure warning signal? *

1 point

While the engine is running, step on and off the brake pedal

Shut off the engine and see if the air pressure leaks down

Shut off the engine with enough air pressure, turn on the electrical power, and step on and off the brake pedal until the low air pressure warning signal comes on

It is not safe to drive a vehicle that has brake drums (or discs) with cracks or that are thinner than the manufacturer’s specifications, generally this will be ___ an inch. *

1 point

1/4

1/3

1/2

It is possible to have an air leak in one system, which will not affect the other. *

1 point

True

False

The air compressor governor controls: *

1 point

When air is pumped into the air storage tanks

The speed of the air compressor

Air pressure applied to the brakes

If your vehicle has an alcohol evaporator, every day during cold weather you should: *

1 point

Check and fill the alcohol level

Change the alcohol from a new bottle

Check the oil for alcohol content

Why must air tanks be drained? *

1 point

To drain all the air out of the tank

To drain moisture and oil out of the tank

To tell you how much air is in the tanks

When you apply the brakes, the brake shoes/linings are pressed against the: *

1 point

Brake drum

Slack adjuster

S-cam

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