Exhaust Brake Problem

[JBurghard]

So I was working on my 93 this weekend... which needless to say I got for $5k so I guess that would explain half the problems I am having with the truck... But I have fixed most... .



Noticed when I got the truck there was a Pac Brake exhaust brake installed in the truck but no signs of an in cab switch or any other way to turn it on... . With a little research I found a wiring diagram at Pac Brakes website and started to do some troubleshooting... . Found that the wiring harness was missing as well as the throttle position switch.



While trying to figure out what was going on with the Exhaust brake today I found a throttle position swith attached to the engine... . Checked the swith and it was bad..... To insure this was my only problem I put 12v DC to the vacum silinoid to check if the brake itself worked..... When the truck was running and 12v was applied nothing happened... . you could see the vacum lines move as you placed and removed the 12v but the brake would not move... . Tried swapping the two vacum lines and still nothing happened.



So what I was wondering was, Is there a way to repair an exhaust brake and would anyone know where I could get another throttle position switch???



Thanks for the Help



James

 

[Midnite]

I'm guessing something's bad in the vacuum cannister. I would think that if you gave Pacbrake a call they could send you a new one fairly cheaply, along with a new throttle position switch.



Mike

 

[tgbol]

Another thing to check is the valve shaft frozen? If the brake has been inactive for a long time it might have rusted in the open posistion. soak it with penetrating oil a couple of times and try moving it by hand.