Low air warning buzzer

Should be under the hood by all the air lines. I believe it's the yellow sensor. Red is for brake lights.

 

No. Its a part of instruments cluster. Can be repaired, but if you try dealer they will want to replace entire cluster.

 

early Version-2 had switch mounted inside gage in instrumental cluster (there were two 4 mm air pipes there), newer have electronic air pressure gauges, sensors are located on firewall oitside ore inside cab (depending on assembly configuration), and addtitional wet tank pressure sensor. Pressure sensors are usually made by Knorr bremse, sometimes Wabco.

Usually I see sensors on cabover outside the cabin, under grill cover, on conventionals they are usually in center of dash, in park brake valve area.

 

Buy a cluster or make a new buzzer yourself

 

Radio shack piezo buzzer soldered onto the cluster for the cheap win. Don't by the loud one, the normal volume one will work fine.

 

What is Radio Shack??!