90 To 140 Psi Question

Topic 10533 | Page 1

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Zachary B.'s Comment
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On the pre trip, you want the PSI 90 to 140 right...now do you pump the accelerator or just wait...

Susan D. 's Comment
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Hmm, we were told 100psi to 125 psi and since it only takes a couple minutes, I'd just wait but that's me.

Dennis R. (Greatest Drive's Comment
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Ask the tester,if you may assist. Some trucks have an idle adjustment,tied to the cruise control, hit resume,automatically, ups the idle.

Stevo Reno's Comment
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RPM's shouldn't affect the time it takes air to build. Those reed valves inside the compressor are only gunna pump so much air lol Unless they've changed how fast they function in last 15-20 years

HOS:

Hours Of Service

HOS refers to the logbook hours of service regulations.
Stevo Reno's Comment
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P.S. -140 psi wont be reached in properly functioning system;

Air Compressor Governor The governor controls when the air compressor will pump air into the air storage tanks. When air tank pressure rises to the "cut-out" level (around 125 pounds per-square-inch or "psi"), the governor stops the compressor from pumping air. When the tank pressure falls to the "cut-in" pressure (around 100 psi), the governor allows the compressor to start pumping again.

Zachary B.'s Comment
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Thanks but when you start at 90 PS I and end at 140, do u start the engine or have the key in the on position?

Susan D. 's Comment
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The ONLY way you are going to build your air supply up to the 125 psi would be if your engine is running.

Sclose757's Comment
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Trucks im training on (Cascadia ) you can rev the engine and air oressure builds up faster (gear driven air compressor ) usually want to be around 120-125 psi before you start the 3 stage air brake check

Zachary B.'s Comment
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The ONLY way you are going to build your air supply up to the 125 psi would be if your engine is running.

Okay, so then the governor cuts out and you do the 4 PSI loss test right.

Sclose757's Comment
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Call it "the applied pressure test" . Examiner may ding you for incorrect verbage.. if you go to a school or company sponsored school the instructer will give you a sheet for their pre trip that will have the wording they prefer for their examiners .

Most get extremely anal on the wording lol

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