10 Questions
What should you do to ensure the low air warning light and buzzer go off?
Pump the brakes down between 20-45 psi
When should you build up air pressure again after checking your trailer brakes?
Between 90-100 psi
What should you do if your slacks/pushrod are not at a 90-degree angle?
Get it repaired/serviced immediately
What should you do if you hear air escaping after applying your service brakes?
Get the tractor protection valve repaired/serviced immediately
When should you disconnect the blue service airline glad hand?
Before turning off the truck engine
What is the purpose of the tractor protection valve/system?
To prevent air loss from the truck's brake system if the trailer breaks away
What are the two components of the tractor protection valve/system?
The tractor protection valve and the red trailer air supply control valve
What causes the tractor protection valve to close automatically?
When the air pressure in the system is low (20-45 psi)
What happens when the tractor protection valve closes?
It stops air from going out of the tractor and lets air out of the trailer's emergency line
What is the consequence of a bad tractor protection valve?
It can lead to an Out of Service violation
Test your knowledge about the tractor protection valve system in trucks with air brakes. Learn about the components and purpose of the system to ensure safety on the road.
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