Engine/Transmission (1994 - 1998) Exhaust brake problem

[RALLER]

I have a 97 3500 with a BD exhaust brake, vacume operated - blue toped and probly 10 years old. The vacume pot is hanging part way on. I called BD and inquired if there was an internal spring inside, and they said no, that it used vacume to pull it off and on. I have the vacume system working corectly. Turn brake on and it goes full on. Turn brake off and it goes to mid tarvel. Vacume will not pull it up to the off position. I am going to remove the pot and take it apart. I wonder what i am going to find? Any clues ? BOB ALLER

 

[Dieseldemon]

How much vacuum do you have? You need about 25 in

 

[RALLER]

I have 26# of vacume in the release hose. Brake pulls on ok, in release pot comes off part way. I can pull pot all the way off by hand and it falls part way back on. Realease vacume has no efect. BOB ALLER

 

[Dieseldemon]

You may have something blocking the release port in the canister. Take the fitting out and check that it is clear