Brake lights stay on

[sandman7655]

Any ideas,bad switch,grounded wire.just trying to figure out.Gonna order new switch,one was missing, my truck has two of them .it has dual brake system.All help appreciated

 

[gimpyrobb]

I would start by pulling the plugs off the switches. If they go out after pulling one of them, you found your issue. Is your system on the wet side or on the air side?

 

[sandman7655]

Switch on wet side under mc is gone.somebody plugged it and plug is hanging there.Under passenger side switch is there and plugged in.

 

[steelandcanvas]

Two brake light switch plugs?

 

[gimpyrobb]

I don't have a split brake sys. so I don't know.

 

[sandman7655]

Yes ,dual brake system.newer model a2.

 

[gimpyrobb]

The switch is just a normally open switch. It could have crud stuck in it or anything. I would see if the brake lights go out when you pull the plug.

 

[sandman7655]

I am gonna pull it tomorrow and see what happens.I am gonna put the switch back on the driverside pack also.

 

[73m819]

bet the truck was switched from wet switch to dry (air), the one that is hanging is the old wet one, I would dink with the switch that is in the air side

 

[sandman7655]

Ok thanks.

 

[cattlerepairman]

Somehow that switch arrangement does not sound right. If you have a split brake system, you have a 1986 or newer truck. Should they have had the hydraulic brake light switch at all, or always the air operated one? A few pictures would help.

Military - so anything is possible. An air pack might have been replaced with an older used part at some point that happened to have a switch in it...who knows.

Dual brake system owners might be able to chime in.

 

[sandman7655]

The switch on the air side is bad or stuck.un plug and brake lights go off.plug in and they stay on.Guess i need a new switch.

 

[gimpyrobb]

Yup.

 

[sandman7655]

Wheres best place to get one,or can you get locally.Thanks

 

[gimpyrobb]

Brake Light Air Operated Switch, M35/M54/M809/M939 etc, 11602160

 

[sandman7655]

Finally got brake lights that work properly.new switch and plug.Now its doesnt loook like i am stopping all the time.Now its time for paint and tires.