Low Air Light Help!

[Bowmanvolfire]

Hello All:

Our 1990 M923A2 just today would not turn off it's low air light or low air "buzzer." The truck does not have CTIS and it shows 120 lbs on the primary and secondary tanks.

We can hear no air leaks. We bled the tanks and did not notice moisture coming out.

Thoughts?

Thanks very much.

John
Chief, BCVFD

 

[98G]

Possibly just a failed sensor - they fail ON.

 

[M35A2-AZ]

Ditto! Or a Fail Safe unit.

 

[Bowmanvolfire]

Thanks for the quick response M35A2-AZ and 98G. Any thoughts on a part number?

Thanks again.

v/r
John

 

[M35A2-AZ]

I would do some trouble shooting before you start changing parts. low air p/n 12375453 There is two of them on the tanks under the passenger side of the cab. Fail Safe. p/n 11669142 Under dash on left side by vent. therooster2001 here on steel soldiers had some for sale.[h=1][/h]

 

[Floridianson]

https://www.steelsoldiers.com/showthread.php?139694-M939-low-air-switch

 

[3poffroad]

I had to replace ours as well. It did the same, stuck on