How do you test the tractor protection valve? Test the tractor protection valve by listening for air exhausting from the trailer service line with the trailer supply valve closed, the trailer service line disconnected and the service brakes applied. If air is exhausting from the trailer service line, the tractor protection valve is defective.
Do I need to test the tractor protection valve&system?
As part of your CDL air brake inspection, you must test the tractor protection valve & system. Hi there smart drivers, Rick with Smart Drive Test talking to you today about how to test the tractor protection system.
How does a tractor protection valve work?
The tractor protection system consists of two valves: The tractor protection valve is comparable to a sentry. It monitors air pressure in the trailer. If the tractor protection valve detects catastrophic air loss in the trailer, it tells the trailer air supply valve to shut off air to the trailer.
How do I know if my tractor protection system is working?
And when the tractor protection system passes those three tests, then you know that the tractor protection system is working on the truck. The first one here is to pump down between 20 and 45psi to ensure that the trailer air supply shuts off air to the trailer.
What should the air pressure be on a tractor protection valve?
Air escapes and the tractor protection valve should pop out between the air compressor cut-out point (120 psi to 135 psi) and 20 psi. The low air pressure warning device activates if the trailer system loses air pressure below around 20 to 45 psi, and a spring in the trailer air supply valve on the dashboard automatically pops the red knob out.
At what PSI will the tractor protection valve?
When the pressure in the supply line reaches 45 psi, the service line port of the tractor protection valve opens. This allows application air pressure to travel down the service line to the trailer when a brake application is made.
What controls the tractor protection valve?
trailer air supplyThe 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).
What is the primary function of a tractor protection valve?
The trailer-supply valve and tractor protection valve make up the tractor protection system. This system prevents air loss from the tractor when not hooked to a trailer or if a trailer breaks away.
How do you fix a tractor protection valve?
1:376:31Tractor Protection WHAT ?? - YouTubeYouTubeStart of suggested clipEnd of suggested clipGet it loose and you turn it by hand and pull the lines straight.MoreGet it loose and you turn it by hand and pull the lines straight.
What position should the tractor protection valve be in?
Charge the trailer air brake system and check that the trailer rolls freely. Then stop and pull out the trailer air supply control (also called tractor protection valve control or trailer emergency valve), or place it in the \"emergency\" position.
When you test the tractor protection valve The Red air supply control knob should go into the position?
When you test the tractor protection valve, the red air supply control knob should go into the ________ position. EXPLANATION: -45 psi, the trailer air supply control knob should pop out, or the valve control should go from the "normal" to the "emergency" position.
What color is tractor protection valve?
red coloredThe other is the tractor protection valve (TPV), located on the towing vehicle's frame or body. The TPV is also called a 'towing vehicle' protection valve. The TSV has a red colored, eight-sided knob and is controlled by the driver.May 19, 2010
How can you manually check the slack adjusters?
With service brakes in the released position, mark the push rod even with the brake chamber. Make a full brake application and mark the push rod again. Measure between the two marks to determine the length of push-rod travel (stroke).
How do you test low air pressure warning signal?
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.
How do you know if your tractor protection valve is bad?
0:576:54How to Test Tractor Protection System for CDL Air Brake InspectionYouTubeStart of suggested clipEnd of suggested clipSo to test it the first test there's three tests for testing the tractor protection system. TheMoreSo to test it the first test there's three tests for testing the tractor protection system. The first one is to pump down the air pressure in the system between 20 and 45.
What does the tractor protection valve look like?
1:182:14TRACTOR PROTECTION VALVE - YouTubeYouTubeStart of suggested clipEnd of suggested clipInside the the valve the valve springing will cause the spool valve to automatically close and goMoreInside the the valve the valve springing will cause the spool valve to automatically close and go into the exhaust. Position which then stops air going out your red glad-hand.
How can you test that air flows to all trailers?
Check That Air Flows to All Trailers. Use the tractor parking brake and/or chock the wheels to hold the vehicle. Wait for air pressure to reach normal, then push in the red "trailer air supply" knob. This will supply air to the emergency (supply) lines.
What is the purpose of a tractor protection valve?
what is the main purpose of the tractor protection valve? The tractor protection valve prevents air loss from the towing vehicle.
What happens when the pressure in the supply line reaches 45 psi?
When the pressure in the supply line reaches 45 psi, the service line port of the tractor protection valve opens. This allows application air pressure to travel down the service line to the trailer when a brake application is made.
How to connect emergency brakes to tractor?
Step 1. Connect the service and emergency brakes of your trailer to the tractor air supply system using the glad hands. These hose coupling devices on the ends of the air lines on the back of your tractor and on the front of your trailer are often color-coded so that you can connect them properly. The service brake air line couplers are colored ...
Why do tractor brakes not work?
A leak in the trailer part of the air system could prevent the tractor brakes from working. The tractor protection valve keeps air in the tractor or truck brake system even if the semitrailer breaks away or develops a bad leak. That way, the tractor's brakes will continue to work.
