my pac brake started to not work till the truck warmed a bit. then a few weeks ago stopped working altogether. i have a master switch that i can turn off for driving in slick conditions. its a lighted switch in the on position. the light wont come on at all now. no power to any part of the under dash wiring for the brake. when it was acting up the light would flicker some times. the switch isnt the problem as ive tested it and theres no power coming in to it. ive gotton so used to it that its annoying too not have it working. any help would be appreciated. i have searched but not found anything other than 1 post about a bad ground, any idea where the break grounds?

 

No power coming in to your dash switch? So of course when the switch is on there's no power to the PacBrake, if this switch is what feeds the PacBrake. You can trace the wire back to wherever it came loose, probably in the fuse box, and reconnect it. Or replace a blown fuse.

My PacBrake won't activate until the engine temp comes up a little, in the winter. In the summer it's ready to go right away.

 

i trace 1 wier bact to a switch? on the intake horn. the other wire goes to a wire tap (light brown wire) on the floor board near my left foot.

 

I don't know about the lighted switch, but when my pac brake acted like yours and quit working a couple of times, it has been the little selonoid switch on top of the intake horn. I've had to replace mine twice and seemed to cure the problem for me. They are about $70.

 

rare one got it, i found an inline fuse tucked away that was blown. problem solved, thanks