At what PSI will the tractor protection valve control knob pop out when performing the air pump down test?

At what psi range is the tractor protection valve likely to close?

Quote From The CDL Manual:

The tractor protection valve is controlled by the “trailer air supply” control valve in the cab. The control valve allows you to open and shut the tractor protection valve. The tractor protection valve will close automatically if air pressure is low (in the range of 20 to 45 psi).

How can you test the tractor protection valve?

You should test the tractor protection valve by allowing the air supply to properly charge, turning off the engine, then releasing air from the system by pressing the brake pedal several times. The tractor protection valve should move into its emergency position when psi drops to an unsafe level.

When the emergency line loses pressure what happens to the tractor protection valve?

When the emergency line loses pressure, it also causes the tractor protection valve to close (the air supply knob will pop out). Emergency lines are often coded with the color red (red hose, red couplers, or other parts) to keep from getting them mixed up with the blue service line.

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What does a pressure protection valve do?

Protects the air brake system in the event of a leak or failure within the air suspension system. Premium Valve has a serviceable replacement filter that minimizes contaminants and other debris from entering other air system accessories.

When hooking a tractor to a trailer you will know the trailer is at the correct height when the?

The trailer is at the right height when: It will be raised slightly when the tractor is backed under it. Which part of the kingpin should the locking jaws close around?

When you test the tractor protection valve The Red air supply control knob should go into the position?

The trailer air supply control – or tractor protection valve control – should pop out – or go from “normal” to “emergency” position when the air pressure falls into the pressure range specified by the manufacturer. – usually within the range of 20-45 psi.

What gear should the tractor transmission be in after you have uncoupled?

You should place the tractor transmission in which gear after you have uncoupled the trailer? Neutral. You are driving a combination vehicle.

What is the maximum operating air pressure?

Actual cut-out pressure must never be higher than 1000 kPa (145 psi ). Actual cut-in pressure must never be less than 552 kPa (80 psi ). The air brake system is defective when cut-out pressure is above 1000 kPa (145 psi ) or cut-in pressure is below 552 kPa (80 psi ).

What can happen if the air pressure gets too low in an air brake system?

The brakes may be sluggish. … Pressing and releasing the brake pedal unnecessarily can let air out faster than the compressor can replace it, reducing the available air pressure. If the air pressure in an air brake system gets too low, the brakes will no longer work.

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