Brake lights wont turn off

[webbgcfd]

I work a fire station where I refit M939's for fire service. on my 3rd truck I noticed that the brake lights wouldn't turn off, checked the air switch and it works fine(I think), came back the next day after air pressure had dropped and lights were off, after looking in to the issue further I noticed that the air isn't bleeding off after depressing the brake peddle. is there a reason that the system would hold air pressure after depressing the brake peddle?

 

[Csm Davis]

Check the front passenger side glad hand it should NOT have a shutoff valve and the cover should have a vent.

 

[webbgcfd]

Fixed the problem thanks for your reply

 

[doghead]

What was the problem?

 

[webbgcfd]

The right front passenger glad hand had been removed and capped,

 

[M35A2-AZ]

The right front passenger glad hand had been removed and capped,

That would do it for sure.

 

[wheelspinner]

Interesting, I have the same problem. I will have to check this tomorrow.

 

[webbgcfd]

2 of my trucks are capped at that location. Is the air supposed to go somewhere else and maybe its plugged?

 

[Csm Davis]

No that gladhand is supposed to breathe so to speak.