I was wondering if exhaust brake of 93 could be retro fitted for a 04. I didnt know if i could make the exhaust part bigger and use all the other stuff. Its on the truck now. It the one that sits right in front of muffler. So just curious if i could somehow make it work if anyone has any ideas. thanks

 

you need the stuff for the ecm to make it work right, you could rig it but it also may not be big enough. it has to be 3.5 or 4 inches cant remember which

 

I think the older one's used vacume to accuate. There is no vacume on the 3rd gen.

 

The biggest question is what size is it? Also where does it mount.

The 04 already has logic in the ECM for a brake, if its a manual.

Jacobs makes a vacuum pump for the Common Rail.

 

so to put a brake on my 04 i have found some vacum pumps for my truck if i buy one of them what else would i need to do to make it work i never had one and have always wanted one but dont really want to give a grand or over for it. thanks

 

You should check the turbo outlet size - I cannot remember when the size changed from 3.5" to 4". You are installing a brake made for 3.5".

 

if i leave the old one on the old truck and forget about it and buy a jacobs vacume pump what do you mean already has logic in the ecm for the brake my truck is manual i think it has a 3.5 at the turbo the exhaust pipe is 3.5 anyway

 

I think the 03/04 had the 3.5 outlet from turbo to muffler, then 4" from there. 04.5 I believe is when they switched to 4" all the way back.

With the Jacobs set up, the **** to activate the brake goes to the ECM, and the solenoid valve between the vacuum pump and brake is controlled by the ECM.

When the switch is on, the engine computer will activate the brake after the accelerator position sensor has been at idle for a little less than 2 seconds. This allows you to leave the switch on when accelerating and shifting gears, and the brake won't come on until you are actually intending to slow down.

Also, if the vehicle speed sensor is zero and the jake switch is on, the ECM will activate the brake until the coolant temp reaches around 180, and then it will shut the brake off.

I think the Jacobs site lets you download the installation directions, which might be helpful.

Also, the solenoid valve is set up so that when not activated, the vacuum pump is pulling against a plugged port, and it is pulling against the diaphragm on the brake when on. It will ruin the vacuum pump if it is run with the hose drawing in air from the atmosphere (no load).

 

so they dont take anything to block the actual exhaust pipe off like the butterfly deals or anything like that.

 

No, they do use a butterfly valve to block the exhaust. I was just describing how the engine control module controls the electric valve that controls vacuum that opens and closes that valve.