Plz help with brake air system 2015 international Pro Star

A truck should go to around 120 or so PSI quietly on the Primary, and Seconadary Gauge.

Shut engine off at 120. Put foot on service brake after pushing mr Buttons in. Wait 60 seconds. Your PSI drop should be 4 or less. Then hold.

Fire it back up, set buttons and then build back to 120.

When you park for the night or sleeper time, you drain both tanks if at all possible. Air dryer to handle the rest.

 

Hm.

The air dryers I know of make a big fart every once in a while. I don't even notice them anymore. Maybe you can put some GasX into your airdryer perhaps?

Or...

Joking aside, have you examined the dryer for algae growth etc.

 

Will it be ok you take that thing to the company shop and let them look it over a few minutes maybe?

You and I can go back and forth all night here but here is not there, your rig need some TLC and Frankly I am out of ideas.

 

Some systems have a quick release valve, or pop off valve, we used to call it. Sometimes it was on the air tank(s) or on drier. When air psi gets to high it lets out a rush of air. Could do it in one big blast or quick multiple ones. When psi builds up, it goes again.

 

that machine gun sound is generally one of the emergency pressure relief valves.

sounds like mabye the unloader in the compressor is sticking or maybe something still inst right with the governor. you should be kicking out before 140psi

 

I agree it bout has to be the pop off. Usually when they keep building it's either a faulty governor which has been eliminated already or one of the govenor lines has some blockage. If neither of those then look at the unloader.

 

Adjust the governor down to about 125 probably to high