PacBrake sticking shut
 

I've got the vacuum-operated PacBrake on my truck......
In colder weather, it will stick shut and won't release for a while. After the engine is up to operating temp, it works as it should. Anyone else had this issue?

Mine did this I removed it and cleaned all the carbon build up and oiled all parts with high temp oil from PacBrake. PacBrake just told me to replace it when I called it now works the best it has ever worked never sticks.

The more you use it, the less carbon builds up. I never turn mine off. Well, almost never.

1. Use the PacBrake oil on it.
2. Exercise it on a regular basis. In the winter, it's helpful to turn it on during warmup (at idle). The extra exhaust pressure makes it warm up about twice as fast.

https://www.dieseltruckresource.com/...74#post2112074

Post #8 got me going again. I used silicone spray and its been good for the last few months.

Exhaust brakes must be used ALL the time. At least once every time you drive. This keeps the carbon from building up around the venturi flap in the housing so they dont stick. I actually dont use any grease anywhere, except some very small amount of anti-seize on the single moving joint on the housing. Grease attracts dirt and debris and I dont want to cause other issues from that. I know that PB says there is stuff they sell that you can use but back when I got mine, they said to use nothing but that anti-seize.....and to make sure the EB cycles ever time you drive. So.....?

The other item you can look at is the solenoid. It can get dirt in it and stick.

Lastly, if yours sticks even though you use it often then in a last resort, you can adjust the shaft to the venturi flap a single turn at a time in the direction that will cause the flap to close less. This is a sensitive part and needs to be done right along with paying attention to where you started from so you can put it back if needed. And, going more in the closed direction will cause more sticking problems.