Air Brakes

Air storage tanks are used to hold compressed air. True or False?

• True

• False

The air compressor may be cooled by which of the following methods?

• Air cooled

• Engine cooling system

• Both A and B

• None of the above.

Fill in the blank: The governor allows the compressor to start pumping again when the tank pressure falls to the 'cut-in' pressure, around ______ psi.

• 50

• 75

• 100

• 125

How does the S-cam brake function when the brake pedal is released?

• The S-cam rotates forward

• The S-cam rotates back and a spring pulls the brake shoes away

• The brake shoes are pushed further into the drum

• The brake shoes are lubricated.

Front-wheel skids from braking are not likely, even on ice, if the control is in the 'normal' position. True or False?

• True

• False

If the brakes are not adjusted properly, neither the regular brakes nor the emergency/parking brakes will work right. True or False?

• True

• False

What is the function of the tractor parking valve?

• Provides air supply

• Releases air supply

• Increases air pressure

• Decreases air pressure

What should you never do when the spring brakes are on?

• Push the brake pedal down

• Pull the brake pedal up

• Turn off the engine

• Increase speed

When parking a vehicle with a modulating control valve, you should move the lever as far as it will go and hold it in place with the ____.

• Locking device

• Brake pedal

• Accelerator

• Steering wheel

What should you check to determine if your vehicle is equipped with ABS?

• The brake pedal

• The control knob

• The certification label

• The steering wheel.