Petersbilt in dash brake pressure vavle

[seldomseen]

Anyone know where abouts they are located on a 2010 Pete 388 when I release my brakes the dash indicator is still screaming at me brakes are on but they definitely are released Thanks Tom

[Rawze]

Hook the red line to a trailer or block it off without connecting the blue line. Push in your red knob and see if air is pissing out of the end of the blue line at all and/or if your problem goes away when the brakes are not being pressed. You can also hook up a pressure gauge to the blue line and compare it to the one in your dash when pressing the brakes too.

-- At least, that is what I would do to ensure it was not a leaky valve or brake chamber feeding back somewhere. I have not had those kinds of issues on my truck yet, so what I say is all speculation at best.