What type of valves are critical devices used to speed up the flow of air during brake applications and release?

Two color-coded flexible hoses connect the tractor and trailer air system. What color is used for the supply/emergency circuit?

What type of valve is this?

What controls air system pressure by stopping and starting compressor loading?

What type of valve is this?

Which of the following is the source of power for the air brake system?

What type of valve removes water and oil that may contaminate supply system air?

Air dryers use a replaceable desiccant cartridge to trap oil and water discharged from the compressor by a process known as _____________.

What type of valve is this?

The trailer control valve should never be used for_____________.

The primary function of _____________valves is to prevent a rapid loss of air from the tractor during a trailer breakaway condition or when either the tractor or trailer develops a severe air leak.

What is the name of this part?

Air pressure from the foot valve (signal air) is supplied to a service-control port on the _______valve.

What color is the octagonal-shaped trailer supply valve used to control the tractor protection system?

What is the name of this part?

Which of the following are the air couplers attached to the trailer hoses connecting the tractor and trailer air systems?

The size of _________is determined by the number of axles on the truck/tractor and trailer.

Compressors are __________.