Mechanical Something weird happen

[ajakapari]

So today I had to go take one of the trucks
(Freightliner m2) to get oil change done and take it to the wash...
I went in the truck started it everything normal , was waiting for the air to go up
While I was doing my log
Then I noticed weird whine noise coming from under the truck to the rear
The air went to 120 both gauges
And it released...
Then all the sudden the bottom gauge started dropping for no reason till the buzzer came on.... and then started claiming back up fast and while climbing back up the strange whine noise was getting quieter and quieter till it was gone when the gauge hit 120.... and I let it run for awhile to make sure it doesn't lose it again everything was fine... after that I went to inspect under no air noise or anything to catch my eye... so any ideas? This never happen in the past .
Thanks in advance !


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[geo]

could be something with air compress , check air hose and values, air lines, brake lines two, just my 2 cents
would talk to a tech and see what he has to say

 

[greasytshirt]

It sounds like a relief valve popped off. These are installed in case there's a governor problem and the air pressure pumps up dangerously high. 120 psi is within the realm of normal, so it's probably not the governor.

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[ajakapari]

I will have it checked this week.
Just in case . Thanks guys


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