Parking Brake Switch

[Jonas947]

Hey everyone,

when i release the Parking Brake on my M1078A1 all the brakes release, but the Parking brake sign in he Dashboard wont go off.
My thought is a bad Switch. I have found it on the wiring diagramm but couldn´t find it on the Truck.

Greetings from Germany

 

[Suprman]

Bad check valve. One of the 3 under the drivers step area. Or bad sender/broken wire.

 

[Ronmar]

The switch is on the top 2way checkvalve under the drivers floor. The switch is easiest accessed behind the grill on the drivers side. 66PSI Haldex normally closed brake switch…